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, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value $ 379,747 $ 447,860  
Mortgage servicing rights, at fair value 5,686,233 4,528,604 $ 2,334,232
Mortgage servicing rights financing receivables, at fair value 1,718,273 1,644,504  
Real estate and other securities, available-for-sale 19,477,728 11,636,581  
Residential mortgage loans, held for sale, at fair value 4,613,612 2,808,529  
Residential mortgage loans, held-for-investment, fair value 484,443 121,088  
Residential mortgage loans subject to repurchase, at fair value 172,336 121,602 $ 0
Derivative assets, at fair value 41,501 10,893  
Restricted cash, at fair value 162,197 164,020  
Liabilities:      
Residential mortgage loan repurchase liability, at fair value 172,336 121,602  
Derivative liabilities, at fair value 6,885 29,389  
Excess spread financing, at fair value 31,777 39,304  
Contingent Consideration 55,222 40,842  
Recurring Basis      
Investments in:      
Excess mortgage servicing rights, principal balance 88,345,237 106,426,363  
Excess mortgage servicing rights, equity method investees, principal balance 33,592,554 41,707,963  
Mortgage servicing rights, principal balance 373,850,061 258,462,703  
Mortgage servicing rights, financing receivables, principal balance 130,984,870 130,516,565  
Servicer advance investments, principal balance 462,843 620,050  
Real estate and other securities, available-for-sale, principal balance 36,159,591 22,152,845  
Residential mortgage loans, held-for-investment, principal balance 502,352 706,111  
Residential mortgage loans, held-for-sale, principal balance 1,531,505 1,043,550  
Residential mortgage loans, held for sale, principal balance 4,675,806 2,934,727  
Residential mortgage loans, held-for-investment, principal balance 452,771 122,260  
Residential mortgage loans subject to repurchase, principal balance 172,336 121,602  
Consumer loans, principal balance 823,917 1,072,577  
Derivative assets, principal balance 8,360,894 840,179  
Cash and cash equivalents, principal balance 528,737 251,058  
Restricted cash, principal balance 162,197 164,020  
Liabilities:      
Repurchase agreements, principal balance 27,917,709 15,555,156  
Notes and bonds payable, principal balance 7,733,135 7,117,909  
Residential mortgage loan repurchase liability, principal balance 172,336 121,602  
Derivative liabilities, principal balance 17,379,407 15,759,782  
Excess spread financing, principal balance 2,962,629 3,492,587  
Mortgage backed securities, issued at fair value 659,700    
Recurring Basis | Carrying Value      
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value 379,747 447,860  
Excess mortgage servicing rights, equity method investees, at fair value 125,596 147,964  
Mortgage servicing rights, at fair value 3,967,960 2,884,100  
Mortgage servicing rights financing receivables, at fair value 1,718,273 1,644,504  
Servicer advance investments, at fair value 581,777 735,846  
Real estate and other securities, available-for-sale 19,477,728 11,636,581  
Residential mortgage loans, held-for-investment, at fair value 441,263 614,241  
Residential mortgage loans, held-for-sale, at fair value 1,429,052 932,480  
Residential mortgage loans, held for sale, at fair value 4,613,612 2,808,529  
Residential mortgage loans, held-for-investment, fair value 484,443 121,088  
Residential mortgage loans subject to repurchase, at fair value 172,336 121,602  
Consumer loans, at fair value 827,545 1,072,202  
Derivative assets, at fair value 41,501 10,893  
Cash and cash equivalents, at fair value 528,737 251,058  
Restricted cash, at fair value 162,197    
Other assets, at fair value 60,654 16,991  
Assets, fair value 35,012,421 23,609,959  
Liabilities:      
Repurchase agreements, at fair value 27,916,225 15,553,969  
Notes and bonds payable, at fair value 7,720,148 7,102,266  
Residential mortgage loan repurchase liability, at fair value 172,336 121,602  
Derivative liabilities, at fair value 6,885 29,389  
Excess spread financing, at fair value 31,777 39,304  
Contingent Consideration 55,222 40,842  
Liabilities, fair value 35,902,593 22,887,372  
Recurring Basis | Fair Value      
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value 379,747 447,860  
Excess mortgage servicing rights, equity method investees, at fair value 125,596 147,964  
Mortgage servicing rights, at fair value 3,967,960 2,884,100  
Mortgage servicing rights financing receivables, at fair value 1,718,273 1,644,504  
Servicer advance investments, at fair value 581,777 735,846  
Real estate and other securities, available-for-sale 19,477,728 11,636,581  
Residential mortgage loans, held-for-investment, at fair value 435,234 625,321  
Residential mortgage loans, held-for-sale, at fair value 1,438,302 958,970  
Residential mortgage loans, held for sale, at fair value 4,613,612 2,808,529  
Residential mortgage loans, held-for-investment, fair value 484,443 121,088  
Residential mortgage loans subject to repurchase, at fair value 172,336 121,602  
Consumer loans, at fair value 849,739 1,054,820  
Derivative assets, at fair value 41,501 10,893  
Cash and cash equivalents, at fair value 528,737 251,058  
Restricted cash, at fair value 162,197 164,020  
Other assets, at fair value 60,655 16,991  
Assets, fair value 35,037,837 23,630,147  
Liabilities:      
Repurchase agreements, at fair value 27,917,709 15,555,156  
Notes and bonds payable, at fair value 7,779,060 7,076,400  
Residential mortgage loan repurchase liability, at fair value 172,336 121,602  
Derivative liabilities, at fair value 6,885 29,389  
Excess spread financing, at fair value 31,777 39,304  
Contingent Consideration 55,222 40,842  
Liabilities, fair value 35,962,989 22,862,693  
Recurring Basis | Fair Value | Fair Value Measured at Net Asset Value Per Share [Member]      
Investments in:      
Other assets, at fair value 74,000 74,300  
Recurring Basis | Fair Value | Level 1      
Investments in:      
Excess mortgage servicing rights (“MSRs”), 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, available-for-sale 0 0  
Residential mortgage loans, held-for-investment, at fair value 0 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  
Cash and cash equivalents, at fair value 528,737 251,058  
Restricted cash, at fair value 162,197 164,020  
Other assets, at fair value 7,952 7,778  
Assets, fair value 698,886 422,856  
Liabilities:      
Repurchase agreements, at fair value 0 0  
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 2      
Investments in:      
Excess mortgage servicing rights (“MSRs”), 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, available-for-sale 11,519,943 2,665,618  
Residential mortgage loans, held-for-investment, at fair value 0 0  
Residential mortgage loans, held-for-sale, at fair value 0 0  
Residential mortgage loans, held for sale, at fair value 1,099,230 213,882  
Residential mortgage loans, held-for-investment, fair value 0 0  
Residential mortgage loans subject to repurchase, at fair value 172,336 121,602  
Consumer loans, at fair value 0 0  
Derivative assets, at fair value 155 42  
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 12,791,664 3,001,144  
Liabilities:      
Repurchase agreements, at fair value 27,917,709 15,555,156  
Notes and bonds payable, at fair value 0 0  
Residential mortgage loan repurchase liability, at fair value 172,336 121,602  
Derivative liabilities, at fair value 5,430 29,166  
Excess spread financing, at fair value 0 0  
Contingent Consideration 0 0  
Liabilities, fair value 28,095,475 15,705,924  
Recurring Basis | Fair Value | Level 3      
Investments in:      
Excess mortgage servicing rights (“MSRs”), at fair value 379,747 447,860  
Excess mortgage servicing rights, equity method investees, at fair value 125,596 147,964  
Mortgage servicing rights, at fair value 3,967,960 2,884,100  
Mortgage servicing rights financing receivables, at fair value 1,718,273 1,644,504  
Servicer advance investments, at fair value 581,777 735,846  
Real estate and other securities, available-for-sale 7,957,785 8,970,963  
Residential mortgage loans, held-for-investment, at fair value 435,234 625,321  
Residential mortgage loans, held-for-sale, at fair value 1,438,302 958,970  
Residential mortgage loans, held for sale, at fair value 3,514,382 2,594,647  
Residential mortgage loans, held-for-investment, fair value 484,443 121,088  
Residential mortgage loans subject to repurchase, at fair value 0 0  
Consumer loans, at fair value 849,739 1,054,820  
Derivative assets, at fair value 41,346 10,851  
Cash and cash equivalents, at fair value 0 0  
Restricted cash, at fair value 0 0  
Other assets, at fair value 52,703 9,213  
Assets, fair value 21,547,287 20,206,147  
Liabilities:      
Repurchase agreements, at fair value 0 0  
Notes and bonds payable, at fair value 7,779,060 7,076,400  
Residential mortgage loan repurchase liability, at fair value 0 0  
Derivative liabilities, at fair value 1,455 223  
Excess spread financing, at fair value 31,777 39,304  
Contingent Consideration 55,222 40,842  
Liabilities, fair value 7,867,514 7,156,769  
Equal to Greater than 90 Days Past Due | Recurring Basis | Fair Value      
Investments in:      
Residential mortgage loans, held for sale, at fair value 267,700 88,700  
Residential mortgage loans, held-for-investment, fair value $ 21,600 $ 400