Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENT - Carrying Values and Fair Values of Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details)

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FAIR VALUE MEASUREMENT - Carrying Values and Fair Values of Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments in:      
Excess mortgage servicing rights, at fair value $ 410,855 $ 505,343  
Mortgage servicing rights, at fair value 4,585,841 5,686,233 $ 4,528,604
Mortgage servicing rights financing receivables, at fair value 1,096,166 1,718,273  
Real estate and other securities 14,244,558 19,477,728  
Residential mortgage loans, held-for-investment, fair value 4,705,816 4,613,612  
Residential mortgage loans subject to repurchase, at fair value 1,452,005 [1] 172,336 [1] $ 121,602
Derivative assets, at fair value 290,144 41,501  
Restricted cash, at fair value 135,619 162,197  
Liabilities:      
Residential mortgage loan repurchase liability, at fair value 26,748 25,435  
Derivative liabilities, at fair value 119,762 6,885  
Excess spread financing, at fair value 18,420 31,777  
Recurring Basis      
Investments in:      
Excess mortgage servicing rights, principal balance 72,688,905 88,345,237  
Excess mortgage servicing rights, equity method investees, principal balance 28,453,512 33,592,554  
Mortgage servicing rights, principal balance 363,269,876 373,850,061  
Mortgage servicing rights, financing receivables, principal balance 72,165,951 130,984,870  
Servicer advance investments, principal balance 449,150 462,843  
Real estate and other securities, principal balance 31,869,681 36,159,591  
Residential mortgage loans, held-for-investment, principal balance   502,352  
Residential mortgage loans, held-for-sale, principal balance 637,138 1,531,505  
Residential mortgage loans, held for sale, principal balance 4,675,833 4,675,806  
Residential mortgage loans, held-for-investment, principal balance 769,348 452,771  
Residential mortgage loans subject to repurchase, principal balance 1,452,005 172,336  
Consumer loans, principal balance 620,983 823,917  
Derivative assets, principal balance 38,427,601 8,360,894  
Notes receivable, principal balance 49,075    
Cash and cash equivalents, principal balance 944,854 528,737  
Restricted cash, principal balance 135,619 162,197  
Liabilities:      
Secured financing agreements, principal balance 17,552,126 27,917,709  
Secured notes and bonds payable, principal balance 7,667,239 7,733,135  
Residential mortgage loan repurchase liability, principal balance 1,452,005 172,336  
Derivative liabilities, principal balance 6,648,152 17,379,407  
Excess spread financing, principal balance 2,190,991 2,962,629  
Mortgage backed securities, issued at fair value 1,700,000 659,700  
Recurring Basis | Unsecured Senior Notes      
Liabilities:      
Unsecured senior notes, net of issuance costs, principal balance 541,516    
Recurring Basis | Carrying Value      
Investments in:      
Excess mortgage servicing rights, at fair value 310,938 379,747  
Excess mortgage servicing rights, equity method investees, at fair value 99,917 125,596  
Mortgage servicing rights, at fair value 3,489,675 3,967,960  
Mortgage servicing rights financing receivables, at fair value 1,096,166 1,718,273  
Servicer advance investments, at fair value 538,056 581,777  
Real estate and other securities 14,244,558 19,477,728  
Residential mortgage loans, held-for-investment, at fair value   441,263  
Residential mortgage loans, held-for-sale, at fair value 509,887 1,429,052  
Residential mortgage loans, held for sale, at fair value 4,705,816 4,613,612  
Residential mortgage loans, held-for-investment, fair value 674,179 484,443  
Residential mortgage loans subject to repurchase, at fair value 1,452,005 172,336  
Consumer loans, at fair value 685,575 827,545  
Derivative assets, at fair value 290,144 41,501  
Notes receivable, at fair value 49,889    
Cash and cash equivalents, at fair value 944,854 528,737  
Restricted cash, at fair value 135,619 162,197  
Other assets, at fair value 48,032 60,654  
Assets, fair value 29,275,310 35,012,421  
Liabilities:      
Secured financing agreements, at fair value 17,547,680 27,916,225  
Secured notes and bonds payable, at fair value 7,644,195 7,720,148  
Residential mortgage loan repurchase liability, at fair value 1,452,005 172,336  
Derivative liabilities, at fair value 119,762 6,885  
Excess spread financing, at fair value 18,420 31,777  
Contingent consideration 14,247 55,222  
Liabilities, fair value 27,337,825 35,902,593  
Recurring Basis | Carrying Value | Unsecured Senior Notes      
Liabilities:      
Unsecured senior notes, net of issuance costs, fair value 541,516    
Recurring Basis | Fair Value      
Investments in:      
Excess mortgage servicing rights, at fair value 310,938 379,747  
Excess mortgage servicing rights, equity method investees, at fair value 99,917 125,596  
Mortgage servicing rights, at fair value 3,489,675 3,967,960  
Mortgage servicing rights financing receivables, at fair value 1,096,166 1,718,273  
Servicer advance investments, at fair value 538,056 581,777  
Real estate and other securities 14,244,558 19,477,728  
Residential mortgage loans, held-for-investment, at fair value   435,234  
Residential mortgage loans, held-for-sale, at fair value 509,887 1,438,302  
Residential mortgage loans, held for sale, at fair value 4,705,816 4,613,612  
Residential mortgage loans, held-for-investment, fair value 674,179 484,443  
Residential mortgage loans subject to repurchase, at fair value 1,452,005 172,336  
Consumer loans, at fair value 685,575 849,739  
Derivative assets, at fair value 290,144 41,501  
Notes receivable, at fair value 49,889    
Cash and cash equivalents, at fair value 944,854 528,737  
Restricted cash, at fair value 135,619 162,197  
Other assets, at fair value 48,032 60,655  
Assets, fair value 29,275,310 35,037,837  
Liabilities:      
Secured financing agreements, at fair value 17,552,126 27,917,709  
Secured notes and bonds payable, at fair value 7,651,325 7,779,060  
Residential mortgage loan repurchase liability, at fair value 1,452,005 172,336  
Derivative liabilities, at fair value 119,762 6,885  
Excess spread financing, at fair value 18,420 31,777  
Contingent consideration 14,247 55,222  
Liabilities, fair value 27,349,401 35,962,989  
Recurring Basis | Fair Value | Equal to Greater than 90 Days Past Due      
Investments in:      
Residential mortgage loans, held for sale, at fair value   267,700  
Residential mortgage loans, held-for-investment, fair value   21,600  
Other assets, at fair value   74,000  
Recurring Basis | Fair Value | Unsecured Senior Notes      
Liabilities:      
Unsecured senior notes, net of issuance costs, fair value 541,516    
Recurring Basis | Fair Value | Level 1      
Investments in:      
Excess mortgage servicing rights, at fair value 0 0  
Excess mortgage servicing rights, equity method investees, at fair value 0 0  
Mortgage servicing rights, at fair value 0 0  
Mortgage servicing rights financing receivables, at fair value 0 0  
Servicer advance investments, at fair value 0 0  
Real estate and other securities 0 0  
Residential mortgage loans, held-for-investment, at fair value   0  
Residential mortgage loans, held-for-sale, at fair value 0 0  
Residential mortgage loans, held for sale, at fair value 0 0  
Residential mortgage loans, held-for-investment, fair value 0 0  
Residential mortgage loans subject to repurchase, at fair value 0 0  
Consumer loans, at fair value 0 0  
Derivative assets, at fair value 0 0  
Notes receivable, at fair value 0    
Cash and cash equivalents, at fair value 944,854 528,737  
Restricted cash, at fair value 135,619 162,197  
Other assets, at fair value 11,187 7,952  
Assets, fair value 1,091,660 698,886  
Liabilities:      
Secured financing agreements, at fair value 0 0  
Secured notes and bonds payable, at fair value 0 0  
Residential mortgage loan repurchase liability, at fair value 0 0  
Derivative liabilities, at fair value 0 0  
Excess spread financing, at fair value 0 0  
Contingent consideration 0 0  
Liabilities, fair value 0 0  
Recurring Basis | Fair Value | Level 1 | Unsecured Senior Notes      
Liabilities:      
Unsecured senior notes, net of issuance costs, fair value 0    
Recurring Basis | Fair Value | Level 2      
Investments in:      
Excess mortgage servicing rights, at fair value 0 0  
Excess mortgage servicing rights, equity method investees, at fair value 0 0  
Mortgage servicing rights, at fair value 0 0  
Mortgage servicing rights financing receivables, at fair value 0 0  
Servicer advance investments, at fair value 0 0  
Real estate and other securities 13,063,634 11,519,943  
Residential mortgage loans, held-for-investment, at fair value   0  
Residential mortgage loans, held-for-sale, at fair value 0 0  
Residential mortgage loans, held for sale, at fair value 3,059,611 1,099,230  
Residential mortgage loans, held-for-investment, fair value 0 0  
Residential mortgage loans subject to repurchase, at fair value 1,452,005 172,336  
Consumer loans, at fair value 0 0  
Derivative assets, at fair value 789 155  
Notes receivable, at fair value 0    
Cash and cash equivalents, at fair value 0 0  
Restricted cash, at fair value 0 0  
Other assets, at fair value 0 0  
Assets, fair value 17,576,039 12,791,664  
Liabilities:      
Secured financing agreements, at fair value 17,552,126 27,917,709  
Secured notes and bonds payable, at fair value 0 0  
Residential mortgage loan repurchase liability, at fair value 1,452,005 172,336  
Derivative liabilities, at fair value 119,481 5,430  
Excess spread financing, at fair value 0 0  
Contingent consideration 0 0  
Liabilities, fair value 19,123,612 28,095,475  
Recurring Basis | Fair Value | Level 2 | Unsecured Senior Notes      
Liabilities:      
Unsecured senior notes, net of issuance costs, fair value 0    
Recurring Basis | Fair Value | Level 3      
Investments in:      
Excess mortgage servicing rights, at fair value 310,938 379,747  
Excess mortgage servicing rights, equity method investees, at fair value 99,917 125,596  
Mortgage servicing rights, at fair value 3,489,675 3,967,960  
Mortgage servicing rights financing receivables, at fair value 1,096,166 1,718,273  
Servicer advance investments, at fair value 538,056 581,777  
Real estate and other securities 1,180,924 7,957,785  
Residential mortgage loans, held-for-investment, at fair value   435,234  
Residential mortgage loans, held-for-sale, at fair value 509,887 1,438,302  
Residential mortgage loans, held for sale, at fair value 1,646,205 3,514,382  
Residential mortgage loans, held-for-investment, fair value 674,179 484,443  
Residential mortgage loans subject to repurchase, at fair value 0 0  
Consumer loans, at fair value 685,575 849,739  
Derivative assets, at fair value 289,355 41,346  
Notes receivable, at fair value 49,889    
Cash and cash equivalents, at fair value 0 0  
Restricted cash, at fair value 0 0  
Other assets, at fair value 36,845 52,703  
Assets, fair value 10,607,611 21,547,287  
Liabilities:      
Secured financing agreements, at fair value 0 0  
Secured notes and bonds payable, at fair value 7,651,325 7,779,060  
Residential mortgage loan repurchase liability, at fair value 0 0  
Derivative liabilities, at fair value 281 1,455  
Excess spread financing, at fair value 18,420 31,777  
Contingent consideration 14,247 55,222  
Liabilities, fair value 8,225,789 $ 7,867,514  
Recurring Basis | Fair Value | Level 3 | Unsecured Senior Notes      
Liabilities:      
Unsecured senior notes, net of issuance costs, fair value 541,516    
Recurring Basis | Fair Value | Fair Value Measured at Net Asset Value Per Share      
Investments in:      
Other assets, at fair value $ 31,800    
[1] See Note 6 for details.