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Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | [1] | Nov. 30, 2019 | [1] | Oct. 31, 2019 | [1] | Sep. 30, 2019 | [1] | Aug. 31, 2019 | [1] | Jul. 31, 2019 | [1] | Jun. 30, 2019 | [1] | May 31, 2019 | [1] | Apr. 30, 2019 | [1] | Mar. 31, 2019 | [1] | Feb. 28, 2019 | [1] | Jan. 31, 2019 | [1] | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,961 | $ 44,502 | $ 43,748 | $ 39,957 | $ 32,014 | $ 26,925 | $ 25,922 | $ 25,190 | $ 170,168 | $ 110,051 | $ 94,502
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 25,766 | 31,256 | 30,813 | 26,276 | 19,053 | 14,751 | 14,175 | 11,595 | 114,111 | 59,574 | 36,178
Interest Income (Expense), Net |  |  |  |  |  |  |  |  |  |  |  |  | 16,195 | 13,246 | 12,935 | 13,681 | 12,961 | 12,174 | 11,747 | 13,595 | 56,057 | 50,477 | 58,324
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net |  |  |  |  |  |  |  |  |  |  |  |  | 42,992 | (50,709) | (117,535) | (61,697) | (81,981) | 19,499 | 20,667 | 38,354 | (186,949) | (3,461) | 3,044
Loss on sale of investments, net |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 4,605 | (10,360) | 0 | (5,428) | (1,726) | (12,444) | (3,775) | (5,755) | (23,373) | (11,530)
Fair value adjustments, net |  |  |  |  |  |  |  |  |  |  |  |  | (14) | (13) | (16) | (13) | (16) | 12 | 27 | 29 | (56) | 52 | 75
Other operating income (expense), net |  |  |  |  |  |  |  |  |  |  |  |  | (28) | 25 | 256 | (231) | (566) | (409) | (339) | (253) | 22 | (1,567) | (201)
General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  |  | (4,010) | (3,758) | (4,265) | (3,954) | (3,492) | (3,964) | (4,006) | (3,643) |  |  |
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  | (3,361) | (3,341) | (3,206) | (3,059) | (2,963) | (2,956) | (2,942) | (2,940) | (12,967) | (11,801) | (10,794)
Net (loss) income to common stockholders |  |  |  |  |  |  |  |  |  |  |  |  | 51,774 | (39,945) | (122,191) | (55,273) | (81,485) | 22,630 | 12,710 | 41,367 | (165,635) | (4,778) | 23,099
Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  |  |  | (43,204) | 55,195 | 111,127 | 86,467 | 50,054 | (21,914) | (9,760) | (45,462) | 209,585 | (27,082) | 23,912
Comprehensive income (loss) to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,570 | $ 15,250 | $ (11,064) | $ 31,194 | $ (31,431) | $ 716 | $ 2,950 | $ (4,095) | $ 43,950 | $ (31,860) | $ 47,011
Net (loss) income per common share-basic and diluted |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.26 | $ (1.65) | $ (4.98) | $ (2.42) | $ (4.02) | $ 1.18 | $ 0.68 | $ 2.22 | $ (7.01) | $ (0.25) | $ 1.37
Common Stock, Dividends, Per Share, Declared | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.45 | $ 0.48 | $ 0.54 | $ 0.54 | $ 0.54 | $ 0.54 | $ 0.54 | $ 0.54 |  |  |
[1] | Amounts declared have been adjusted to reflect the effect of the 1-for-3 reverse stock split.

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