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Other Assets (Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
AOCI from derivative hedging instruments:
Balance at beginning of period	$ (28,114)	$ 16,160	$ 3,121	$ (11,424)
Net (loss)/gain on Swaps	(233)	5,390	(30,384)	32,974
Amortization of de-designated hedging instruments, net	(685)	0	(1,769)	0
Balance at end of period	(29,032)	21,550	(29,032)	21,550
Interest Rate Contract
Derivative [Line Items]
Assets pledged	25,728		25,728		$ 32,803
Swaps, at fair value
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 3,152,000		$ 3,152,000		$ 3,217,000
Weighted average fixed-pay rate	2.25%		2.25%		2.42%
Weighted Average Variable Interest Rate	2.09%		2.09%		2.56%
Interest (expense)/income attributable to Swaps	$ (322)	$ (547)	$ 1,561	$ (4,187)
Weighted average Swap rate paid	2.29%	2.19%	2.32%	2.09%
Weighted average Swap rate received	2.24%	2.09%	2.40%	1.86%
Swaps, at fair value | Within 30 days
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 0		$ 0
Weighted average fixed-pay rate	0.00%		0.00%		0.00%
Weighted Average Variable Interest Rate	0.00%		0.00%		0.00%
Swaps, at fair value | Over 30 days to 3 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 0		$ 100,000
Weighted average fixed-pay rate	0.00%		0.00%		1.71%
Weighted Average Variable Interest Rate	0.00%		0.00%		2.50%
Swaps, at fair value | Over 3 months to 6 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 0		$ 100,000
Weighted average fixed-pay rate	0.00%		0.00%		1.71%
Weighted Average Variable Interest Rate	0.00%		0.00%		2.50%
Swaps, at fair value | Over 6 months to 12 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 1,630,000		$ 1,630,000		$ 0
Weighted average fixed-pay rate	2.27%		2.27%		0.00%
Weighted Average Variable Interest Rate	2.06%		2.06%		0.00%
Swaps, at fair value | Over 12 months to 24 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 800,000		$ 800,000		$ 1,630,000
Weighted average fixed-pay rate	1.73%		1.73%		2.27%
Weighted Average Variable Interest Rate	2.12%		2.12%		2.50%
Swaps, at fair value | Over 24 months to 36 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 500,000		$ 500,000		$ 800,000
Weighted average fixed-pay rate	2.73%		2.73%		2.57%
Weighted Average Variable Interest Rate	2.13%		2.13%		2.64%
Swaps, at fair value | Over 36 months to 48 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 182,000		$ 182,000		$ 0
Weighted average fixed-pay rate	2.83%		2.83%		0.00%
Weighted Average Variable Interest Rate	2.09%		2.09%		0.00%
Swaps, at fair value | Over 48 months to 60 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 40,000		$ 40,000		$ 417,000
Weighted average fixed-pay rate	3.11%		3.11%		2.88%
Weighted Average Variable Interest Rate	2.27%		2.27%		2.63%
Swaps, at fair value | Over 84 months
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 0		$ 0		$ 170,000
Weighted average fixed-pay rate	0.00%		0.00%		3.00%
Weighted Average Variable Interest Rate	0.00%		0.00%		2.66%
Swaps, at fair value | Hedging
Derivative [Line Items]
Aggregate notional amount of derivatives	$ 3,200,000		$ 3,200,000
Average maturity term of swaps			18 months
Swaps, at fair value | Minimum | LIBOR
Derivative [Line Items]
Derivative, variable interest rate, term			1 month
Swaps, at fair value | Maximum | Hedging
Derivative [Line Items]
Maximum maturity term of swaps			50 months
Swaps, at fair value | Maximum | LIBOR
Derivative [Line Items]
Derivative, variable interest rate, term			3 months
Swap | Non-Hedging
Derivative [Line Items]
Loss on derivative	929,000	$ 4,000	$ 17,300	$ 4,400
Realized loss	3,700		17,700
Agency MBS, at fair value | Interest Rate Contract
Derivative [Line Items]
Assets pledged	2,333		2,333		$ 2,735
Restricted cash | Interest Rate Contract
Derivative [Line Items]
Assets pledged	$ 23,395		$ 23,395		$ 30,068

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