Earnings Per Share (Comparison Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share [Abstract]
Basic (loss) earnings per share	$ (0.29)	$ 5.59	$ 2.40	$ 11.78
Net (loss) income	$ (10,972)	$ 254,520	$ 91,448	$ 572,219
Weighted average common shares outstanding	38,110,368	45,544,060	38,078,116	48,580,541
Warrants and options		1,689,743	413,228	1,627,137
Restricted stock units		631,841	443,443	659,402
LTIP awards		974,347	823,778	1,020,310
Employee stock purchase plan			1,215
Weighted average common shares and common share equivalents outstanding - diluted	38,110,368	48,839,991	39,759,780	51,887,390
Diluted (loss) earnings per share	$ (0.29)	$ 5.21	$ 2.30	$ 11.03

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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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