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Per Share Information - Basic and Diluted Earnings Per Share Attributable to Common Stock (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Amounts attributable to common stock: |  |
Net income attributable to common stock | $ 38,686 | $ 120,488
Weighted average shares: |  |
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares) | 144,454 | 145,110
Effect of dilutive unvested non-participating stock-based awards (in shares) | 2,333 | 1,348
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares) | 146,787 | 146,458

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