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Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 32,014 | $ 26,925 | $ 25,922 | $ 25,190 | $ 24,124 | $ 23,103 | $ 24,856 | $ 22,419 | $ 110,051 | $ 94,502 | $ 91,898
Interest expense | 19,053 | 14,751 | 14,175 | 11,595 | 10,056 | 9,889 | 8,714 | 7,519 | 59,574 | 36,178 | 25,231
Net interest income | 12,961 | 12,174 | 11,747 | 13,595 | 14,068 | 13,214 | 16,142 | 14,900 | 50,477 | 58,324 | 66,667
Gain (loss) on derivative instruments, net | (81,981) | 19,499 | 20,667 | 38,354 | 12,678 | 5,993 | (15,802) | 175 | (3,461) | 3,044 | (5,606)
Loss on sale of investments, net | (5,428) | (1,726) | (12,444) | (3,775) | (902) | (5,211) | (3,709) | (1,708) | (23,373) | (11,530) | (4,238)
Fair value adjustments, net | 16 | (12) | (27) | (29) | (12) | (23) | (30) | (10) | (52) | (75) | (103)
Other operating income (expense), net | (566) | (409) | (339) | (253) | (50) | (109) | 4 | (46) | (1,567) | (201) | 880
General and administrative expenses | 3,492 | 3,964 | 4,006 | 3,643 | 3,843 | 3,599 | 4,097 | 4,280 |  |  |
Preferred stock dividends | 2,963 | 2,956 | 2,942 | 2,940 | 2,910 | 2,808 | 2,641 | 2,435 | 11,801 | 10,794 | 9,185
Net income (loss) to common shareholders | (81,485) | 22,630 | 12,710 | 41,367 | 19,053 | 7,503 | (10,073) | 6,616 | (4,778) | 23,099 | 33,914
Other comprehensive income (loss) | 50,054 | (21,914) | (9,760) | (45,462) | (14,584) | 6,144 | 12,375 | 19,977 | (27,082) | 23,912 | (19,841)
Comprehensive income (loss) to common shareholders | $ (31,431) | $ 716 | $ 2,950 | $ (4,095) | $ 4,469 | $ 13,647 | $ 2,302 | $ 26,593 | $ (31,860) | $ 47,011 | $ 14,073
Net income (loss) per common share | $ (1.34) | $ 0.39 | $ 0.23 | $ 0.74 | $ 0.36 | $ 0.15 | $ (0.20) | $ 0.13 | $ (0.08) | $ 0.46 | $ 0.69
Dividends declared per common share | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 |  |  |

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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256 + Details
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