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Other Assets (Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
AOCI from derivative hedging instruments:
Balance at beginning of period	$ (22,675)	$ 3,121
Net loss on Swaps	(50,127)	(10,445)
Amortization of de-designated hedging instruments, net	1,594	(341)
Balance at end of period	(71,208)	(7,665)
Interest Rate Contract
Derivative [Line Items]
Assets pledged	0		$ 19,018
Swaps, at fair value
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 3,172,000
Weighted average fixed-pay rate	0.00%		2.24%
Weighted Average Variable Interest Rate	0.00%		1.81%
Interest (expense)/income attributable to Swaps	$ (3,359)	$ 1,191
Weighted average Swap rate paid	2.09%	2.31%
Weighted average Swap rate received	1.65%	2.49%
Swaps, at fair value | Over 3 months to 6 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 200,000
Weighted average fixed-pay rate	0.00%		2.05%
Weighted Average Variable Interest Rate	0.00%		1.70%
Swaps, at fair value | Over 6 months to 12 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 1,430,000
Weighted average fixed-pay rate	0.00%		2.30%
Weighted Average Variable Interest Rate	0.00%		1.77%
Swaps, at fair value | Over 12 months to 24 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 1,300,000
Weighted average fixed-pay rate	0.00%		2.11%
Weighted Average Variable Interest Rate	0.00%		1.86%
Swaps, at fair value | Over 24 months to 36 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 20,000
Weighted average fixed-pay rate	0.00%		1.38%
Weighted Average Variable Interest Rate	0.00%		1.90%
Swaps, at fair value | Over 36 months to 48 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 222,000
Weighted average fixed-pay rate	0.00%		2.88%
Weighted Average Variable Interest Rate	0.00%		1.84%
Swaps, at fair value | Minimum | LIBOR
Derivative [Line Items]
Derivative, variable interest rate, term	1 month
Swaps, at fair value | Maximum | LIBOR
Derivative [Line Items]
Derivative, variable interest rate, term	3 months
Agency MBS, at fair value | Interest Rate Contract
Derivative [Line Items]
Assets pledged	$ 0		$ 2,241
Restricted cash | Interest Rate Contract
Derivative [Line Items]
Assets pledged	0		$ 16,777
Swap | Hedging
Derivative [Line Items]
Loss on derivative	71,200
Swap | Non-Hedging
Derivative [Line Items]
Loss on derivative	4,300	$ 8,900
Realized loss	$ 9,400	$ 7,800

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