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Significant Accounting Policies - Summary of reconciliation of weighted average shares outstanding along with earnings per share attributable to restricted shares of common stock (Details 1) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Accounting Policies |  |  |
Net income (loss) available for stockholders | $ 175,402 | $ 162,511 | $ (141,246)
Less: Adjustments for losses attributable to participating securities | (1,839) | (2,102) | (147)
Net income (loss) used in calculating per share amounts | $ 173,563 | $ 160,409 | $ (141,393)
Weighted average shares outstanding (including participating securities) | 215,198 | 217,194 | 217,509
Adjustment for participating securities | (2,453) | (2,891) | (3,282)
Shares used in calculating basic and diluted earnings (loss) per share | 212,745 | 214,303 | 214,227

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