Investment in Securities (Summary of Investment in Securities) (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Securities, Available-for-sale [Line Items]
Current Principal	$ 1,802,133
Unamortized Premium (Discount)	(106,592)
Amortized Cost	1,808,453
Gross Unrealized Gains	38,995
Gross Unrealized Losses	(8,428)
Investment Owned At Fair Value, Net	1,839,020
Securities, at fair value	1,875,929
Securities sold short, at fair value	$ (36,909)	$ (850,577)
Fair Value		$ 2,939,311
Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	4.25%
Weighted Average Yield	4.24%
Weighted average life	5 years 128 days
Long
Securities, Available-for-sale [Line Items]
Current Principal	$ 1,838,327
Unamortized Premium (Discount)	(106,399)
Amortized Cost	1,844,840
Gross Unrealized Gains	38,994
Gross Unrealized Losses	(7,905)
Securities, at fair value	$ 1,875,929
Long \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	4.20%
Weighted Average Yield	4.29%
Weighted average life	5 years 124 days
Long \| 15-year fixed-rate mortgages
Securities, Available-for-sale [Line Items]
Current Principal	$ 176,990
Unamortized Premium (Discount)	3,542
Amortized Cost	180,532
Gross Unrealized Gains	1,710
Gross Unrealized Losses	(250)
Securities, at fair value	$ 181,992
Long \| 15-year fixed-rate mortgages \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	3.09%
Weighted Average Yield	2.41%
Weighted average life	3 years 99 days
Long \| 20-year fixed-rate mortgages
Securities, Available-for-sale [Line Items]
Current Principal	$ 820
Unamortized Premium (Discount)	53
Amortized Cost	873
Gross Unrealized Gains	8
Gross Unrealized Losses	0
Securities, at fair value	$ 881
Long \| 20-year fixed-rate mortgages \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	4.54%
Weighted Average Yield	3.00%
Weighted average life	4 years 274 days
Long \| 30-year fixed-rate mortgages
Securities, Available-for-sale [Line Items]
Current Principal	$ 1,132,923
Unamortized Premium (Discount)	55,885
Amortized Cost	1,188,808
Gross Unrealized Gains	13,225
Gross Unrealized Losses	(2,593)
Securities, at fair value	$ 1,199,440
Long \| 30-year fixed-rate mortgages \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	4.24%
Weighted Average Yield	3.13%
Weighted average life	5 years 234 days
Long \| Adjustable rate mortgages
Securities, Available-for-sale [Line Items]
Current Principal	$ 10,772
Unamortized Premium (Discount)	387
Amortized Cost	11,159
Gross Unrealized Gains	83
Gross Unrealized Losses	(62)
Securities, at fair value	$ 11,180
Long \| Adjustable rate mortgages \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	3.98%
Weighted Average Yield	2.26%
Weighted average life	2 years 204 days
Long \| Reverse mortgages
Securities, Available-for-sale [Line Items]
Current Principal	$ 123,557
Unamortized Premium (Discount)	8,606
Amortized Cost	132,163
Gross Unrealized Gains	2,325
Gross Unrealized Losses	(22)
Securities, at fair value	$ 134,466
Long \| Reverse mortgages \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	4.45%
Weighted Average Yield	2.86%
Weighted average life	6 years 307 days
Long \| Interest only securities
Securities, Available-for-sale [Line Items]
Amortized Cost	$ 35,775
Gross Unrealized Gains	1,920
Gross Unrealized Losses	(647)
Securities, at fair value	$ 37,048
Long \| Interest only securities \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	2.40%
Weighted Average Yield	9.03%
Weighted average life	3 years 183 days
Long \| Non-Agency RMBS
Securities, Available-for-sale [Line Items]
Current Principal	$ 250,196
Unamortized Premium (Discount)	(106,851)
Amortized Cost	143,345
Gross Unrealized Gains	12,937
Gross Unrealized Losses	(2,668)
Securities, at fair value	$ 153,614
Long \| Non-Agency RMBS \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	3.63%
Weighted Average Yield	6.66%
Weighted average life	5 years 95 days
Long \| CMBS
Securities, Available-for-sale [Line Items]
Current Principal	$ 71,217
Unamortized Premium (Discount)	(38,214)
Amortized Cost	33,003
Gross Unrealized Gains	3,115
Gross Unrealized Losses	(26)
Securities, at fair value	$ 36,092
Long \| CMBS \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	3.44%
Weighted Average Yield	9.38%
Weighted average life	8 years 241 days
Long \| Non-Agency IOs
Securities, Available-for-sale [Line Items]
Amortized Cost	$ 5,146
Gross Unrealized Gains	1,936
Gross Unrealized Losses	0
Securities, at fair value	$ 7,082
Long \| Non-Agency IOs \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	0.98%
Weighted Average Yield	20.49%
Weighted average life	3 years 150 days
Long \| CLOs
Securities, Available-for-sale [Line Items]
Amortized Cost	$ 68,187
Gross Unrealized Gains	569
Gross Unrealized Losses	(1,356)
Securities, at fair value	$ 67,400
Long \| CLOs \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	3.23%
Weighted Average Yield	15.56%
Weighted average life	5 years 212 days
Long \| Asset-backed securities, backed by consumer loans
Securities, Available-for-sale [Line Items]
Current Principal	$ 47,785
Unamortized Premium (Discount)	(8,817)
Amortized Cost	38,968
Gross Unrealized Gains	628
Gross Unrealized Losses	(280)
Securities, at fair value	$ 39,316
Long \| Asset-backed securities, backed by consumer loans \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	14.86%
Weighted Average Yield	14.43%
Weighted average life	1 year 69 days
Long \| Corporate debt securities
Securities, Available-for-sale [Line Items]
Current Principal	$ 24,067
Unamortized Premium (Discount)	(20,990)
Amortized Cost	3,077
Gross Unrealized Gains	106
Gross Unrealized Losses	(1)
Securities, at fair value	$ 3,182
Long \| Corporate debt securities \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	0.00%
Weighted Average Yield	11.06%
Weighted average life	1 year 124 days
Long \| Corporate equity securities
Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,804
Securities, at fair value	4,236
Corporate equity, gross unrealized gains	432
Corporate equity, gross unrealized losses	0
Short
Securities, Available-for-sale [Line Items]
Current Principal	(36,194)
Unamortized Premium (Discount)	(193)
Investment Sold, Not yet Purchased, Sale Proceeds	(36,387)
Gross Unrealized Gains	1
Gross Unrealized Losses	(523)
Securities sold short, at fair value	$ (36,909)
Short \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	1.72%
Weighted Average Yield	1.54%
Weighted average life	4 years 223 days
Short \| Corporate debt securities
Securities, Available-for-sale [Line Items]
Current Principal	$ (450)
Unamortized Premium (Discount)	(6)
Investment Sold, Not yet Purchased, Sale Proceeds	(456)
Gross Unrealized Gains	1
Gross Unrealized Losses	(18)
Securities sold short, at fair value	$ (473)
Short \| Corporate debt securities \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	5.46%
Weighted Average Yield	5.21%
Weighted average life	5 years 62 days
Short \| U.S. Treasury securities
Securities, Available-for-sale [Line Items]
Current Principal	$ (26,260)
Unamortized Premium (Discount)	(29)
Investment Sold, Not yet Purchased, Sale Proceeds	(26,289)
Gross Unrealized Gains	0
Gross Unrealized Losses	(441)
Securities sold short, at fair value	$ (26,730)
Short \| U.S. Treasury securities \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	2.00%
Weighted Average Yield	2.00%
Weighted average life	5 years 223 days
Short \| European sovereign bonds
Securities, Available-for-sale [Line Items]
Current Principal	$ (9,484)
Unamortized Premium (Discount)	(158)
Investment Sold, Not yet Purchased, Sale Proceeds	(9,642)
Gross Unrealized Gains	0
Gross Unrealized Losses	(64)
Securities sold short, at fair value	$ (9,706)
Short \| European sovereign bonds \| Weighted Average
Securities, Available-for-sale [Line Items]
Weighted Average Coupon	0.75%
Weighted Average Yield	0.12%
Weighted average life	1 year 303 days

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