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Per Share Information (Tables)
9 Months Ended
Sep. 30, 2021
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):
Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Amounts attributable to common stock:
Net income attributable to common stock$174,365 $162,913 $381,159 $275,545 
Weighted average shares outstanding:
Weighted average shares outstanding for basic earnings per share attributable to common stock140,008 140,542 140,134 141,610 
Effect of dilutive unvested non-participating stock-based awards4,296 3,821 4,314 3,375 
Weighted average shares outstanding for diluted earnings per share attributable to common stock144,304 144,363 144,448 144,985