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Quarterly Financial Information (Notes) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information [Abstract] |
Quarterly Financial Information [Text Block] | QUARTERLY RESULTS (UNAUDITED)
| Year Ended December 31, 2019 |  |  |  |  |  |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Interest income | $ | 39,957 |  |  | $ | 43,748 |  |  | $ | 44,502 |  |  | $ | 41,961 |
Interest expense | 26,276 |  |  | 30,813 |  |  | 31,256 |  |  | 25,766 |
Net interest income | 13,681 |  |  | 12,935 |  |  | 13,246 |  |  | 16,195 |
(Loss) gain on derivative instruments, net | (61,697) |  |  | (117,535) |  |  | (50,709) |  |  | 42,992 |
(Loss) gain on sale of investments, net | — |  |  | (10,360) |  |  | 4,605 |  |  | — |
Fair value adjustments | (13) |  |  | (16) |  |  | (13) |  |  | (14) |
Other operating (expense) income, net | (231) |  |  | 256 |  |  | 25 |  |  | (28) |
General and administrative expenses | (3,954) |  |  | (4,265) |  |  | (3,758) |  |  | (4,010) |
Preferred stock dividends | (3,059) |  |  | (3,206) |  |  | (3,341) |  |  | (3,361) |
Net (loss) income to common shareholders | (55,273) |  |  | (122,191) |  |  | (39,945) |  |  | 51,774 |
Other comprehensive income (loss) | 86,467 |  |  | 111,127 |  |  | 55,195 |  |  | (43,204) |
Comprehensive income (loss) to common shareholders | $ | 31,194 |  |  | $ | (11,064) |  |  | $ | 15,250 |  |  | $ | 8,570 |
Net (loss) income per common share | $ | (2.42) |  |  | $ | (4.98) |  |  | $ | (1.65) |  |  | $ | 2.26 |
Dividends declared per common share | $ | 0.54 |  |  | $ | 0.54 |  |  | $ | 0.48 |  |  | $ | 0.45 |
| Year Ended December 31, 2018 |  |  |  |  |  |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Interest income | $ | 25,190 |  |  | $ | 25,922 |  |  | $ | 26,925 |  |  | $ | 32,014 |
Interest expense | 11,595 |  |  | 14,175 |  |  | 14,751 |  |  | 19,053 |
Net interest income | 13,595 |  |  | 11,747 |  |  | 12,174 |  |  | 12,961 |
Gain (loss) on derivative instruments, net | 38,354 |  |  | 20,667 |  |  | 19,499 |  |  | (81,981) |
Loss on sale of investments, net | (3,775) |  |  | (12,444) |  |  | (1,726) |  |  | (5,428) |
Fair value adjustments | 29 |  |  | 27 |  |  | 12 |  |  | (16) |
Other operating expense, net | (253) |  |  | (339) |  |  | (409) |  |  | (566) |
General and administrative expenses | (3,643) |  |  | (4,006) |  |  | (3,964) |  |  | (3,492) |
Preferred stock dividends | (2,940) |  |  | (2,942) |  |  | (2,956) |  |  | (2,963) |
Net income (loss) to common shareholders | 41,367 |  |  | 12,710 |  |  | 22,630 |  |  | (81,485) |
Other comprehensive (loss) income | (45,462) |  |  | (9,760) |  |  | (21,914) |  |  | 50,054 |
Comprehensive (loss) income to common shareholders | $ | (4,095) |  |  | $ | 2,950 |  |  | $ | 716 |  |  | $ | (31,431) |
Net income (loss) per common share | $ | 2.22 |  |  | $ | 0.68 |  |  | $ | 1.18 |  |  | $ | (4.02) |
Dividends declared per common share | $ | 0.54 |  |  | $ | 0.54 |  |  | $ | 0.54 |  |  | $ | 0.54 |

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- Definition Quarterly Financial Information [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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