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Selected Quarterly Information (Unaudited) (Notes) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information [Text Block] | SELECTED QUARTERLY INFORMATION (UNAUDITED)
| 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 derivatives 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 and other income (expense) amounts, net | (36 | ) |  | 34 |  |  | (86 | ) |  | (38 | )
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 |
| Year Ended December 31, 2016
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Operating results: |  |  |  |  |  |  |
Interest income | $ | 25,089 |  |  | $ | 22,816 |  |  | $ | 21,135 |  |  | $ | 22,858 |
Interest expense | 6,310 |  |  | 6,100 |  |  | 6,068 |  |  | 6,753 |
Net interest income | 18,779 |  |  | 16,716 |  |  | 15,067 |  |  | 16,105 |
(Loss) gain on derivatives instruments, net | (48,264 | ) |  | (16,297 | ) |  | 2,409 |  |  | 56,546 |
Loss on sale of investments, net | (3,941 | ) |  | (297 | ) |  | — |  |  | — |
Fair value adjustments and other income (expense) amounts, net | 87 |  |  | 318 |  |  | 579 |  |  | (1 | )
General and administrative expenses | (4,092 | ) |  | (3,671 | ) |  | (3,355 | ) |  | (3,589 | )
Preferred stock dividends | (2,294 | ) |  | (2,294 | ) |  | (2,294 | ) |  | (2,303 | )
Net (loss) income to common shareholders | (39,725 | ) |  | (5,525 | ) |  | 12,406 |  |  | 66,758 |
Other comprehensive income (loss) | 41,728 |  |  | 22,947 |  |  | 670 |  |  | (85,186 | )
Comprehensive income (loss) to common shareholders | $ | 2,003 |  |  | $ | 17,422 |  |  | $ | 13,076 |  |  | $ | (18,428 | )
Net (loss) income per common share | $ | (0.81 | ) |  | $ | (0.11 | ) |  | $ | 0.25 |  |  | $ | 1.36 |
Dividends declared per common share | $ | 0.21 |  |  | $ | 0.21 |  |  | $ | 0.21 |  |  | $ | 0.21 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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