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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