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Per Share Information (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share Attributable to Common Stock
The amounts used to compute basic and diluted earnings per share attributable to common stock consisted of the following (in thousands):
 Year Ended December 31,
 202020192018
Amounts attributable to common stock:   
Net income attributable to common stock$445,596 $402,044 $293,346 
Weighted average shares:   
Weighted average shares outstanding for basic earnings per share attributable to common stock141,380 145,710 152,963 
Effect of dilutive unvested non-participating stock-based awards3,867 1,824 1,263 
Weighted average shares outstanding for diluted earnings per share attributable to common stock145,247 147,534 154,226