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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
	Mar. 31, 2020	Mar. 31, 2019
Amounts attributable to common stock:
Net income attributable to common stock	$ 38,686	$ 120,488
Weighted average shares:
Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares)	144,454	145,110
Effect of dilutive unvested non-participating stock-based awards (in shares)	2,333	1,348
Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares)	146,787	146,458

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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