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Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Net income (loss) attributable to common stockholders—Basic and diluted: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to the Company | $ 24,920 | $ (1,000) | $ (885) | $ (13) | $ 404 | $ 16,858 | $ 2,188 | $ (134) | $ 23,022 | $ 19,316 | $ (6,712)
Preferred dividends |  |  |  |  |  |  |  |  | (6,795) | (3,860) | (1,986)
Undistributed net income (loss) allocated to common stockholders |  |  |  |  |  |  |  |  | (4,357) | 3,022 | (18,126)
Distributed and undistributed net income (loss)—basic |  |  |  |  |  |  |  |  | 15,822 | 15,192 | (8,844)
Net (income) loss attributable to redeemable noncontrolling interests in operating partnership |  |  |  |  |  |  |  |  | 2,038 | 1,899 | 0
Distributed and undistributed net income (loss)—diluted |  |  |  |  |  |  |  |  | $ 17,860 | $ 17,091 | $ (8,844)
Weighted average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding – basic (in shares) |  |  |  |  |  |  |  |  | 30,473 | 26,648 | 25,888
Effect of assumed conversion of operating partnership units (in shares) |  |  |  |  |  |  |  |  | 4,233 | 4,470 | 0
Incentive fee shares |  |  |  |  |  |  |  |  | 0 | 77 | 0
Weighted average common shares outstanding – diluted (in shares) | 38,178 | 31,483 | 31,469 | 27,267 | 25,532 | 33,874 | 32,418 | 28,343 | 34,706 | 31,195 | 25,888
Income (loss) per share—basic: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) allocated to common stockholders per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.52 | $ 0.57 | $ (0.34)
Income (loss) per share—diluted: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) allocated to common stockholders per share (in dollars per share) | $ 0.65 | $ (0.09) | $ (0.09) | $ (0.07) | $ (0.03) | $ 0.55 | $ 0.04 | $ (0.04) | $ 0.51 | $ 0.55 | $ (0.34)
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders—Basic and diluted: |  |  |  |  |  |  |  |  |  |  |
Preferred dividends |  |  |  |  |  |  |  |  | $ (6,795) |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders—Basic and diluted: |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  | (20,179) | $ (12,170) | $ (9,282)
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders—Basic and diluted: |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  | (138) | (122) | (105)
Undistributed net income (loss) allocated to common stockholders |  |  |  |  |  |  |  |  | 0 | 27 | 0
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders—Basic and diluted: |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  | (267) | (77) | (41)
Undistributed net income (loss) allocated to common stockholders |  |  |  |  |  |  |  |  | $ 0 | $ 38 | $ 0

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