Income per Share (Summary Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 39,125	$ 101,728
Weighted average shares/units outstanding-basic (shares)	146,565,564	135,704,525
Potentially dilutive common units:
Stock options (shares)	11,286	33,839
Unvested incentive units (shares)	122,601	147,874
2014 market performance-based awards (shares)	733,743	242,562
Weighted average shares/units outstanding-diluted (shares)	147,433,194	136,128,800
Income per share:
Basic ($ per share/unit)	$ 0.27	$ 0.75
Diluted ($ per share/unit)	$ 0.27	$ 0.75

Incremental Common Shares Attributable To Performance-Based Awards

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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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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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