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Income per Share (Summary of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 86,298	$ 66,145
Weighted average shares/units outstanding-basic (shares/units)	205,714,173	159,297,027
Potentially dilutive common shares:
Stock options (shares)	0	4
Unvested incentive units (shares)	302,016	237,336
Forward equity offering (shares)	0	283,388
Market performance-based awards (shares)	491,287	603,900
Weighted average shares/units outstanding-diluted (shares/units)	206,507,476	160,421,655
Income per share:
Basic (in dollars per share/unit)	$ 0.42	$ 0.42
Diluted (in dollars per share/unit)	$ 0.42	$ 0.41

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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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