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Quarterly Financial Information (Notes) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information | QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
| Year Ended December 31, 2018
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Operating results: |  |  |  |  |  |  |
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 | $ | 0.74 |  |  | $ | 0.23 |  |  | $ | 0.39 |  |  | $ | (1.34 | )
Dividends declared per common share | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |
| Year Ended December 31, 2017
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Operating results: |  |  |  |  |  |  |
Interest income | $ | 22,419 |  |  | $ | 24,856 |  |  | $ | 23,103 |  |  | $ | 24,124 |
Interest expense | 7,519 |  |  | 8,714 |  |  | 9,889 |  |  | 10,056 |
Net interest income | 14,900 |  |  | 16,142 |  |  | 13,214 |  |  | 14,068 |
Gain (loss) on derivative instruments, net | 175 |  |  | (15,802 | ) |  | 5,993 |  |  | 12,678 |
Loss on sale of investments, net | (1,708 | ) |  | (3,709 | ) |  | (5,211 | ) |  | (902 | )
Fair value adjustments | 10 |  |  | 30 |  |  | 23 |  |  | 12 |
Other operating (expense) income, net | (46 | ) |  | 4 |  |  | (109 | ) |  | (50 | )
General and administrative expenses | (4,280 | ) |  | (4,097 | ) |  | (3,599 | ) |  | (3,843 | )
Preferred stock dividends | (2,435 | ) |  | (2,641 | ) |  | (2,808 | ) |  | (2,910 | )
Net income (loss) to common shareholders | 6,616 |  |  | (10,073 | ) |  | 7,503 |  |  | 19,053 |
Other comprehensive income (loss) | 19,977 |  |  | 12,375 |  |  | 6,144 |  |  | (14,584 | )
Comprehensive income (loss) to common shareholders | $ | 26,593 |  |  | $ | 2,302 |  |  | $ | 13,647 |  |  | $ | 4,469 |
Net income (loss) per common share | $ | 0.13 |  |  | $ | (0.20 | ) |  | $ | 0.15 |  |  | $ | 0.36 |
Dividends declared per common share | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.18 |

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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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