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Significant Accounting Policies - Earnings per share (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Significant Accounting Policies |  |  |
Net income (loss) available for stockholders | $ (87,111) | $ 175,402 | $ 162,511
Less: Adjustments for losses attributable to participating securities | (334) | (1,839) | (2,102)
Net income (loss) used in calculating per share amounts | $ (87,445) | $ 173,563 | $ 160,409
Weighted average shares outstanding (including participating securities) | 214,730 | 215,198 | 217,194
Adjustment for participating securities | (2,509) | (2,453) | (2,891)
Shares used in calculating basic and diluted (loss) earnings per share | 212,221 | 212,745 | 214,303

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