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Derivative Instruments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivative [Line Items]      
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 1,054,500   $ 992,586
Interest rate caps:      
Derivative [Line Items]      
Notional amount $ 845,500   $ 1,292,500
Interest rate caps: | Minimum      
Derivative [Line Items]      
Strike rate 3.00%   2.43%
Interest rate caps: | Maximum      
Derivative [Line Items]      
Strike rate 7.80%   11.61%
Interest rate caps: | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Notional amount $ 228,500 $ 685,000  
Cost of derivative $ 62 $ 348  
Interest rate caps: | Not Designated as Hedging Instrument | Minimum      
Derivative [Line Items]      
Strike rate 3.00% 2.43%  
Interest rate caps: | Not Designated as Hedging Instrument | Maximum      
Derivative [Line Items]      
Strike rate 7.80% 7.80%  
Interest rate floors:      
Derivative [Line Items]      
Notional amount $ 9,000,000   $ 10,850,000
Interest rate floors: | Minimum      
Derivative [Line Items]      
Strike rate floor (0.25%)   (0.25%)
Interest rate floors: | Maximum      
Derivative [Line Items]      
Strike rate 2.00%   2.00%
Interest rate floors: | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Notional amount $ 2,000,000 $ 0  
Strike rate 1.63% 0.00%  
Cost of derivative $ 75 $ 0  
Credit Default Swap      
Derivative [Line Items]      
Notional amount 50,000    
Maximum exposure 1,500    
Change in market value threshold for settlement 250    
Mortgages      
Derivative [Line Items]      
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 845,500   $ 805,500