Quarterly report pursuant to Section 13 or 15(d)

DEBT OBLIGATIONS - Narrative (Details)

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DEBT OBLIGATIONS - Narrative (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
agreement
Debt Instrument [Line Items]  
Face amount of debt $ 15,484,977
Repurchase Agreements | Total Repurchase Agreements  
Debt Instrument [Line Items]  
Face amount of debt $ 8,758,199
Repurchase Agreements | Stockholders' Equity, Total | Counterparty Concentration Risk  
Debt Instrument [Line Items]  
Number of repurchase agreements, outstanding | agreement 0