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Fair Value Measurements - Schedule of Unpaid Principal, Fair Value and Impact of Changes in Fair Value on Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Assets:        
Loans held for investment, at fair value $ 13,678,263 $ 8,753,653 $ 13,678,263 $ 8,753,653
Liabilities:        
Securitized debt at fair value, collateralized by loans held for investment, fair value 9,388,657 6,941,097 9,388,657 6,941,097
Non-agency RMBS | Subordinated        
Assets:        
Fair Value 13,993 18,602 13,993 18,602
Gain (Loss) on Change in Fair Value (545) (1,983) 1,246 5,568
Non-agency RMBS | Senior, interest-only        
Assets:        
Unpaid Principal/ Notional 4,862,461 5,648,339 4,862,461 5,648,339
Fair Value 210,850 253,539 210,850 253,539
Gain (Loss) on Change in Fair Value 3,156 (26,844) (13,290) (4,512)
Non-agency RMBS | Subordinated, interest-only        
Assets:        
Unpaid Principal/ Notional 201,378 266,927 201,378 266,927
Fair Value 7,826 12,024 7,826 12,024
Gain (Loss) on Change in Fair Value 1,836 (1,169) 2,311 2,118
Agency MBS | Residential Pass-through        
Assets:        
Unpaid Principal/ Notional 577,522   577,522  
Fair Value 602,829   602,829  
Gain (Loss) on Change in Fair Value (2,359)   (4,816)  
Agency MBS | Commercial Pass-through        
Assets:        
Unpaid Principal/ Notional 564,379   564,379  
Fair Value 570,105   570,105  
Gain (Loss) on Change in Fair Value (546)   (2,398)  
Agency MBS | Interest-only        
Assets:        
Unpaid Principal/ Notional 3,021,840 3,356,491 3,021,840 3,356,491
Fair Value 104,367 144,800 104,367 144,800
Gain (Loss) on Change in Fair Value (367) (920) 465 (490)
Loans held for investment        
Assets:        
Gain (Loss) on Change in Fair Value (65,643) 32,991 206,181 146,635
Loans held for investment, Unpaid Principal/Notional 13,525,820 8,868,783 13,525,820 8,868,783
Loans held for investment, at fair value 13,678,263 8,753,653 13,678,263 8,753,653
Securitized debt        
Assets:        
Gain (Loss) on Change in Fair Value 16,831 (22,738) (78,289) (89,767)
Liabilities:        
Securitized debt at fair value, collateralized by loans held for investment, Unpaid Principal/Notional 9,395,854 7,059,265 9,395,854 7,059,265
Securitized debt at fair value, collateralized by loans held for investment, fair value $ 9,388,657 $ 6,941,097 $ 9,388,657 $ 6,941,097