Investment in Securities (Summary of Investment in Securities) (Details) - USD ($)
$ in Thousands |
9 Months Ended |
12 Months Ended |
Sep. 30, 2022 |
Dec. 31, 2021 |
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 1,562,334
|
$ 1,993,242
|
| Unamortized Premium (Discount) |
|
(150,657)
|
(143,262)
|
| Amortized Cost |
|
1,510,819
|
1,975,520
|
| Gross Unrealized Gains |
|
33,362
|
36,882
|
| Gross Unrealized Losses |
|
(220,951)
|
(45,567)
|
| Investment Owned At Fair Value, Net |
|
1,323,230
|
1,966,835
|
| Securities, at fair value(1)(2) |
[1],[2] |
1,522,772
|
2,087,360
|
| Securities sold short, at fair value |
|
$ (199,542)
|
$ (120,525)
|
| Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
1.66%
|
3.52%
|
| Weighted Average Yield |
|
4.05%
|
3.24%
|
| Weighted average life |
|
7 years 1 month 2 days
|
5 years 11 months 8 days
|
| Long |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 1,778,662
|
$ 2,115,078
|
| Unamortized Premium (Discount) |
|
(152,013)
|
(144,853)
|
| Amortized Cost |
|
1,725,791
|
2,095,765
|
| Gross Unrealized Gains |
|
17,749
|
36,320
|
| Gross Unrealized Losses |
|
(220,768)
|
(44,725)
|
| Securities, at fair value(1)(2) |
|
$ 1,522,772
|
$ 2,087,360
|
| Long | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
1.67%
|
3.37%
|
| Weighted Average Yield |
|
4.29%
|
3.37%
|
| Weighted average life |
|
7 years 4 months 17 days
|
5 years 10 months 24 days
|
| Long | 15-year fixed-rate mortgages |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 156,524
|
$ 223,140
|
| Unamortized Premium (Discount) |
|
4,390
|
10,668
|
| Amortized Cost |
|
160,914
|
233,808
|
| Gross Unrealized Gains |
|
0
|
696
|
| Gross Unrealized Losses |
|
(18,212)
|
(1,953)
|
| Securities, at fair value(1)(2) |
|
$ 142,702
|
$ 232,551
|
| Long | 15-year fixed-rate mortgages | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
2.54%
|
2.65%
|
| Weighted Average Yield |
|
1.76%
|
1.44%
|
| Weighted average life |
|
4 years 5 months 12 days
|
4 years 5 months 12 days
|
| Long | 20-year fixed-rate mortgages |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 7,382
|
$ 46,353
|
| Unamortized Premium (Discount) |
|
393
|
2,800
|
| Amortized Cost |
|
7,775
|
49,153
|
| Gross Unrealized Gains |
|
0
|
16
|
| Gross Unrealized Losses |
|
(1,488)
|
(1,280)
|
| Securities, at fair value(1)(2) |
|
$ 6,287
|
$ 47,889
|
| Long | 20-year fixed-rate mortgages | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
2.41%
|
2.42%
|
| Weighted Average Yield |
|
1.56%
|
1.31%
|
| Weighted average life |
|
7 years 1 month 2 days
|
5 years 7 months 13 days
|
| Long | 30-year fixed-rate mortgages |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 1,037,876
|
$ 1,265,499
|
| Unamortized Premium (Discount) |
|
22,495
|
59,047
|
| Amortized Cost |
|
1,060,371
|
1,324,546
|
| Gross Unrealized Gains |
|
0
|
8,187
|
| Gross Unrealized Losses |
|
(130,864)
|
(12,311)
|
| Securities, at fair value(1)(2) |
|
$ 929,507
|
$ 1,320,422
|
| Long | 30-year fixed-rate mortgages | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
3.32%
|
3.01%
|
| Weighted Average Yield |
|
2.91%
|
2.13%
|
| Weighted average life |
|
8 years 11 months 4 days
|
7 years
|
| Long | Adjustable rate mortgages |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 6,672
|
$ 9,131
|
| Unamortized Premium (Discount) |
|
584
|
566
|
| Amortized Cost |
|
7,256
|
9,697
|
| Gross Unrealized Gains |
|
0
|
25
|
| Gross Unrealized Losses |
|
(758)
|
(266)
|
| Securities, at fair value(1)(2) |
|
$ 6,498
|
$ 9,456
|
| Long | Adjustable rate mortgages | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
3.41%
|
3.15%
|
| Weighted Average Yield |
|
2.29%
|
2.12%
|
| Weighted average life |
|
4 years 9 months 14 days
|
4 years 7 months 13 days
|
| Long | Reverse mortgages |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 30,502
|
$ 50,601
|
| Unamortized Premium (Discount) |
|
3,189
|
3,215
|
| Amortized Cost |
|
33,691
|
53,816
|
| Gross Unrealized Gains |
|
0
|
300
|
| Gross Unrealized Losses |
|
(2,895)
|
(1,106)
|
| Securities, at fair value(1)(2) |
|
$ 30,796
|
$ 53,010
|
| Long | Reverse mortgages | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
3.47%
|
3.06%
|
| Weighted Average Yield |
|
2.39%
|
2.21%
|
| Weighted average life |
|
4 years 8 months 1 day
|
4 years 2 months 1 day
|
| Long | Interest only securities |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Amortized Cost |
|
$ 20,101
|
$ 32,607
|
| Gross Unrealized Gains |
|
1,510
|
3,371
|
| Gross Unrealized Losses |
|
(2,086)
|
(2,690)
|
| Securities, at fair value(1)(2) |
|
$ 19,525
|
$ 33,288
|
| Long | Interest only securities | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
1.53%
|
3.46%
|
| Weighted Average Yield |
|
9.63%
|
8.91%
|
| Weighted average life |
|
5 years 6 months 14 days
|
4 years 3 months 29 days
|
| Long | Non-Agency RMBS |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 331,522
|
$ 326,762
|
| Unamortized Premium (Discount) |
|
(117,925)
|
(130,015)
|
| Amortized Cost |
|
213,597
|
196,747
|
| Gross Unrealized Gains |
|
5,021
|
10,276
|
| Gross Unrealized Losses |
|
(25,319)
|
(5,418)
|
| Securities, at fair value(1)(2) |
|
$ 193,299
|
$ 201,605
|
| Long | Non-Agency RMBS | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
3.85%
|
4.17%
|
| Weighted Average Yield |
|
7.28%
|
6.15%
|
| Weighted average life |
|
6 years 2 months 12 days
|
3 years 11 months 26 days
|
| Long | CMBS |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 38,996
|
$ 46,873
|
| Unamortized Premium (Discount) |
|
(17,920)
|
(23,570)
|
| Amortized Cost |
|
21,076
|
23,303
|
| Gross Unrealized Gains |
|
388
|
469
|
| Gross Unrealized Losses |
|
(5,787)
|
(892)
|
| Securities, at fair value(1)(2) |
|
$ 15,677
|
$ 22,880
|
| Long | CMBS | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
2.60%
|
2.84%
|
| Weighted Average Yield |
|
8.45%
|
7.00%
|
| Weighted average life |
|
8 years 1 month 28 days
|
7 years 10 months 6 days
|
| Long | Non-Agency IOs |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Amortized Cost |
|
$ 23,450
|
$ 16,701
|
| Gross Unrealized Gains |
|
4,471
|
1,405
|
| Gross Unrealized Losses |
|
(797)
|
(394)
|
| Securities, at fair value(1)(2) |
|
$ 27,124
|
$ 17,712
|
| Long | Non-Agency IOs | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
0.20%
|
0.64%
|
| Weighted Average Yield |
|
14.84%
|
14.71%
|
| Weighted average life |
|
8 years 4 months 28 days
|
5 years 5 months 4 days
|
| Long | CLOs |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Amortized Cost |
|
$ 45,013
|
$ 70,444
|
| Gross Unrealized Gains |
|
2,999
|
5,919
|
| Gross Unrealized Losses |
|
(17,477)
|
(14,034)
|
| Securities, at fair value(1)(2) |
|
$ 30,535
|
$ 62,329
|
| Long | CLOs | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
1.87%
|
3.59%
|
| Weighted Average Yield |
|
8.69%
|
8.94%
|
| Weighted average life |
|
3 years 6 months 14 days
|
3 years 1 month 9 days
|
| Long | Asset-backed securities, backed by consumer loans |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 111,727
|
$ 118,154
|
| Unamortized Premium (Discount) |
|
(26,001)
|
(43,139)
|
| Amortized Cost |
|
85,726
|
75,015
|
| Gross Unrealized Gains |
|
432
|
1,242
|
| Gross Unrealized Losses |
|
(10,590)
|
(3,149)
|
| Securities, at fair value(1)(2) |
|
$ 75,568
|
$ 73,108
|
| Long | Asset-backed securities, backed by consumer loans | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
12.00%
|
11.65%
|
| Weighted Average Yield |
|
12.93%
|
14.80%
|
| Weighted average life |
|
1 year 2 months 4 days
|
1 year 3 months 18 days
|
| Long | Corporate debt securities |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ 25,161
|
$ 28,565
|
| Unamortized Premium (Discount) |
|
(21,244)
|
(24,425)
|
| Amortized Cost |
|
3,917
|
4,140
|
| Gross Unrealized Gains |
|
88
|
1,723
|
| Gross Unrealized Losses |
|
(403)
|
(309)
|
| Securities, at fair value(1)(2) |
|
$ 3,602
|
$ 5,554
|
| Long | Corporate debt securities | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
0.00%
|
0.65%
|
| Weighted Average Yield |
|
0.00%
|
7.50%
|
| Weighted average life |
|
1 year 1 month 6 days
|
1 year 11 months 15 days
|
| Long | Corporate equity securities |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Amortized Cost |
|
$ 10,578
|
$ 5,788
|
| Gross Unrealized Gains |
|
2,840
|
2,691
|
| Gross Unrealized Losses |
|
(2,249)
|
(923)
|
| Securities, at fair value(1)(2) |
|
11,169
|
7,556
|
| Long | U.S. Treasury securities |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
32,300
|
|
| Unamortized Premium (Discount) |
|
26
|
|
| Amortized Cost |
|
32,326
|
|
| Gross Unrealized Gains |
|
0
|
|
| Gross Unrealized Losses |
|
(1,843)
|
|
| Securities, at fair value(1)(2) |
|
$ 30,483
|
|
| Long | U.S. Treasury securities | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
2.89%
|
|
| Weighted Average Yield |
|
2.85%
|
|
| Weighted average life |
|
5 years 3 months 29 days
|
|
| Short |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ (216,328)
|
(121,836)
|
| Unamortized Premium (Discount) |
|
1,356
|
1,591
|
| Investment Sold, Not yet Purchased, Sale Proceeds |
|
(214,972)
|
(120,245)
|
| Gross Unrealized Gains |
|
15,613
|
562
|
| Gross Unrealized Losses |
|
(183)
|
(842)
|
| Securities sold short, at fair value |
|
$ (199,542)
|
$ (120,525)
|
| Short | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
1.93%
|
0.87%
|
| Weighted Average Yield |
|
2.21%
|
1.02%
|
| Weighted average life |
|
4 years 11 months 4 days
|
6 years 8 months 23 days
|
| Short | Corporate debt securities |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
|
$ (93,750)
|
| Unamortized Premium (Discount) |
|
|
1,421
|
| Investment Sold, Not yet Purchased, Sale Proceeds |
|
|
(92,329)
|
| Gross Unrealized Gains |
|
|
406
|
| Gross Unrealized Losses |
|
|
(267)
|
| Securities sold short, at fair value |
|
|
$ (92,190)
|
| Short | Corporate debt securities | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
|
1.13%
|
| Weighted Average Yield |
|
|
1.31%
|
| Weighted average life |
|
|
7 years 9 months 21 days
|
| Short | U.S. Treasury securities |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ (193,100)
|
|
| Unamortized Premium (Discount) |
|
4,956
|
|
| Investment Sold, Not yet Purchased, Sale Proceeds |
|
(188,144)
|
|
| Gross Unrealized Gains |
|
10,723
|
|
| Gross Unrealized Losses |
|
(183)
|
|
| Securities sold short, at fair value |
|
$ (177,604)
|
|
| Short | U.S. Treasury securities | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
2.16%
|
|
| Weighted Average Yield |
|
2.51%
|
|
| Weighted average life |
|
5 years 2 months 26 days
|
|
| Short | European sovereign bonds |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Current Principal |
|
$ (23,228)
|
$ (28,086)
|
| Unamortized Premium (Discount) |
|
(3,600)
|
170
|
| Investment Sold, Not yet Purchased, Sale Proceeds |
|
(26,828)
|
(27,916)
|
| Gross Unrealized Gains |
|
4,890
|
156
|
| Gross Unrealized Losses |
|
0
|
(575)
|
| Securities sold short, at fair value |
|
$ (21,938)
|
$ (28,335)
|
| Short | European sovereign bonds | Weighted Average |
|
|
|
| Securities, Available-for-sale [Line Items] |
|
|
|
| Weighted Average Coupon |
|
0.01%
|
0.01%
|
| Weighted Average Yield |
|
0.04%
|
0.05%
|
| Weighted average life |
|
2 years 5 months 4 days
|
3 years 2 months 4 days
|
|
|