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Selected Quarterly Information (Unaudited) (Notes) | 12 Months Ended
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Dec. 31, 2015
Selected Quarterly Information (Unaudited) [Abstract] |
Quarterly Financial Information [Text Block] | SELECTED QUARTERLY INFORMATION (UNAUDITED)
| 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 |
| Year Ended December 31, 2014
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Operating results: |  |  |  |  |  |  |
Interest income | $ | 27,640 |  |  | $ | 27,718 |  |  | $ | 26,000 |  |  | $ | 24,286 |
Interest expense | 7,633 |  |  | 6,572 |  |  | 6,058 |  |  | 5,652 |
Net interest income | 20,007 |  |  | 21,146 |  |  | 19,942 |  |  | 18,634 |
(Loss) gain on derivatives instruments, net | (13,422 | ) |  | (23,074 | ) |  | 4,842 |  |  | (21,739 | )
(Loss) gain on sale of investments, net | (3,307 | ) |  | (477 | ) |  | 9,057 |  |  | 10,950 |
Fair value adjustments and other income (expense) amounts, net | 107 |  |  | 225 |  |  | 939 |  |  | (17 | )
General and administrative expenses | (4,119 | ) |  | (3,819 | ) |  | (3,914 | ) |  | (4,155 | )
Preferred stock dividends | (2,294 | ) |  | (2,294 | ) |  | (2,294 | ) |  | (2,294 | )
Net (loss) income to common shareholders | (3,028 | ) |  | (8,293 | ) |  | 28,572 |  |  | 1,379 |
Other comprehensive income (loss) | 29,560 |  |  | 35,199 |  |  | (14,482 | ) |  | 4,855 |
Comprehensive income to common shareholders | $ | 26,532 |  |  | $ | 26,906 |  |  | $ | 14,090 |  |  | $ | 6,234 |
Net (loss) income per common share | $ | (0.06 | ) |  | $ | (0.15 | ) |  | $ | 0.52 |  |  | $ | 0.03 |
Dividends declared per common share | $ | 0.25 |  |  | $ | 0.25 |  |  | $ | 0.25 |  |  | $ | 0.25 |

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: 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=51655806&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 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=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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