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Earnings per Share - Schedule of Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Net Income (Loss) | $ 27,931 | $ 20,523 | $ 74,987 | $ 34,296
Noncontrolling interests | (933) | (1,731) | (1,619) | (2,782)
Net Income (Loss) Attributable to Stockholders | 26,998 | 18,792 | 73,368 | 31,514
Preferred stockholder dividends | (2,085) | (2,084) | (6,253) | (6,252)
Net Income (Loss) Attributable to Common Stockholders | $ 24,913 | $ 16,708 | $ 67,115 | $ 25,262
Shares: |  |  |  |
Basic: Weighted-average number of common shares outstanding (in shares) | 7,175 | 7,212 | 7,195 | 6,942
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares) | 1,281 | 1,280 | 1,268 | 226
Diluted: Weighted-average number of common shares outstanding (in shares) | 8,456 | 8,492 | 8,463 | 7,168
Earnings (Loss) per share—Basic (in $ per share) | $ 3.47 | $ 2.32 | $ 9.33 | $ 3.64
Earnings (Loss) per Share—Diluted (in $ per share) | $ 3.19 | $ 2.21 | $ 8.67 | $ 3.52

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