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Selected Quarterly Information (Unaudited) (Notes) | 12 Months Ended
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Dec. 31, 2016
Selected Quarterly Information (Unaudited) [Abstract] |
Quarterly Financial Information [Text Block] | SELECTED QUARTERLY INFORMATION (UNAUDITED)
| 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 |
| Year Ended December 31, 2015
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Operating results: |  |  |  |  |  |  |
Interest income | $ | 24,099 |  |  | $ | 24,527 |  |  | $ | 26,096 |  |  | $ | 25,522 |
Interest expense | 5,371 |  |  | 5,542 |  |  | 5,859 |  |  | 5,833 |
Net interest income | 18,728 |  |  | 18,985 |  |  | 20,237 |  |  | 19,689 |
(Loss) gain on derivatives instruments, net | (25,323 | ) |  | 17,090 |  |  | (52,749 | ) |  | 17,854 |
Gain (loss) on sale of investments, net | 1,308 |  |  | (1,491 | ) |  | 113 |  |  | (908 | )
Fair value adjustments and other income (expense) amounts, net | 72 |  |  | 632 |  |  | (199 | ) |  | 174 |
General and administrative expenses | (4,257 | ) |  | (4,754 | ) |  | (4,379 | ) |  | (4,278 | )
Preferred stock dividends | (2,294 | ) |  | (2,294 | ) |  | (2,294 | ) |  | (2,294 | )
Net (loss) income to common shareholders | (11,766 | ) |  | 28,168 |  |  | (39,271 | ) |  | 30,237 |
Other comprehensive income (loss) | 23,054 |  |  | (39,679 | ) |  | 27,418 |  |  | (44,877 | )
Comprehensive income (loss) to common shareholders | $ | 11,288 |  |  | $ | (11,511 | ) |  | $ | (11,853 | ) |  | $ | (14,640 | )
Net (loss) income per common share | $ | (0.21 | ) |  | $ | 0.52 |  |  | $ | (0.74 | ) |  | $ | 0.61 |
Dividends declared per common share | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.24 |

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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 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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