Income per Share (Summary of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 95,869	$ 86,298
Weighted average shares outstanding-basic (shares)	207,809,383	205,714,173
Potentially dilutive common shares:
Unvested incentive units (shares)	323,064	302,016
Forward equity offering (shares)	221,448	0
Market performance-based awards (shares)	172,354	491,287
Weighted average shares/units outstanding-diluted (shares/units)	208,526,249	206,507,476
Income per share:
Basic (in dollars per share)	$ 0.46	$ 0.42
Diluted (in dollars per share)	$ 0.46	$ 0.42

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted 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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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