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Selected Quarterly Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 24,124 | $ 23,103 | $ 24,856 | $ 22,419 | $ 22,858 | $ 21,135 | $ 22,816 | $ 25,089 | $ 94,502 | $ 91,898 | $ 100,244
Interest expense | 10,056 | 9,889 | 8,714 | 7,519 | 6,753 | 6,068 | 6,100 | 6,310 | 36,178 | 25,231 | 22,605
Net interest income | 14,068 | 13,214 | 16,142 | 14,900 | 16,105 | 15,067 | 16,716 | 18,779 | 58,324 | 66,667 | 77,639
Gain (loss) on derivative instruments, net | 12,678 | 5,993 | (15,802) | 175 | 56,546 | 2,409 | (16,297) | (48,264) | 3,044 | (5,606) | (43,128)
Loss on sale of investments, net | (902) | (5,211) | (3,709) | (1,708) | 0 | 0 | (297) | (3,941) | (11,530) | (4,238) | (978)
Fair value adjustments and other income (expense) amounts, net | (38) | (86) | 34 | (36) | (1) | 579 | 318 | 87 |  |  |
General and administrative expenses | 3,843 | 3,599 | 4,097 | 4,280 | 3,589 | 3,355 | 3,671 | 4,092 |  |  |
Preferred stock dividends | 2,910 | 2,808 | 2,641 | 2,435 | 2,303 | 2,294 | 2,294 | 2,294 | 10,794 | 9,185 | 9,176
Net income (loss) to common shareholders | 19,053 | 7,503 | (10,073) | 6,616 | 66,758 | 12,406 | (5,525) | (39,725) | 23,099 | 33,914 | 7,368
Other comprehensive income | (14,584) | 6,144 | 12,375 | 19,977 | (85,186) | 670 | 22,947 | 41,728 | 23,912 | (19,841) | (34,084)
Comprehensive income (loss) to common shareholders | $ 4,469 | $ 13,647 | $ 2,302 | $ 26,593 | $ (18,428) | $ 13,076 | $ 17,422 | $ 2,003 | $ 47,011 | $ 14,073 | $ (26,716)
Net income per common share-basic and diluted | $ 0.36 | $ 0.15 | $ (0.20) | $ 0.13 | $ 1.36 | $ 0.25 | $ (0.11) | $ (0.81) | $ 0.46 | $ 0.69 | $ 0.14
Dividends declared per common share | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.21 | $ 0.21 | $ 0.21 | $ 0.21 |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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