Income per Share (Summary of Basic and Diluted Earnings per Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income per Share
Net income available to common stockholders	$ 31,990	$ 9,091	$ 62,970	$ 23,835
Weighted average shares outstanding-basic	96,295,585	80,542,329	93,875,415	79,164,167
Stock options	203,078	225,931	193,985	206,803
Class C Units (2007 Grant)	73,855	154,229	67,856	142,747
Unvested incentive units	180,377	179,267	152,927	155,504
Excess exchange value of the 2026 Debentures	758,916	1,920,061	722,782	1,781,415
Weighted average shares outstanding-diluted	97,511,811	83,021,817	95,012,965	81,450,636
Basic	$ 0.33	$ 0.11	$ 0.67	$ 0.30
Diluted	$ 0.33	$ 0.11	$ 0.66	$ 0.29

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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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