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Per Share Information - Basic and Diluted Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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 stock (in shares)	141,380	145,710	152,963
Effect of dilutive unvested non-participating stock-based awards (in shares)	3,867	1,824	1,263
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares)	145,247	147,534	154,226

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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