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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Amounts attributable to common stock:
Net income attributable to common stock	$ 136,068	$ 124,551	$ 283,900	$ 236,530
Weighted average shares:
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares)	145,913	152,562	145,654	154,087
Effect of dilutive unvested non-participating stock-based awards (in shares)	1,525	1,125	1,420	1,111
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares)	147,438	153,687	147,074	155,198

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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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