Income per Share (Summary of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 66,145	$ 39,125
Weighted average shares/units outstanding-basic (shares/units)	159,297,027	146,565,564
Potentially dilutive common shares:
Stock options (shares)	4	11,286
Unvested incentive units (shares)	237,336	122,601
Forward equity offering (shares)	283,388	0
Market performance-based awards (shares)	603,900	733,743
Weighted average shares/units outstanding-diluted (shares/units)	160,421,655	147,433,194
Income per share:
Basic (in dollars per share/unit)	$ 0.42	$ 0.27
Diluted (in dollars per share/unit)	$ 0.41	$ 0.27

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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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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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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