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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Amounts attributable to common stock:        
Net income attributable to common stock $ 162,913 $ 136,068 $ 275,545 $ 283,900
Weighted average shares:        
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares) 140,542 145,913 141,610 145,654
Effect of dilutive unvested non-participating stock-based awards (in shares) 3,821 1,525 3,375 1,420
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares) 144,363 147,438 144,985 147,074