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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Amounts attributable to common stock: |  |  |  |
Net income attributable to common stock | $ 73,946 | $ 27,344 | $ 112,632 | $ 147,832
Weighted average shares: |  |  |  |
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares) | 139,856 | 145,935 | 142,154 | 145,525
Effect of dilutive unvested non-participating stock-based awards (in shares) | 3,665 | 1,306 | 3,059 | 1,340
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares) | 143,521 | 147,241 | 145,213 | 146,865

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