Net Income Per Share (Loss) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net income (loss)	$ (1,061,956)	$ 87,080	$ (989,404)	$ 283,346
Income (loss) from continuing operations			(994,584)	283,346
Income from discontinued operations			$ 5,180
Denominator:
Average number of common shares outstanding	62,572,000	62,414,000	62,524,000	59,601,000
Effect of dilutive securities:
Stock awards and warrants (in shares)		345,000		370,000
Weighted average shares, diluted	62,572,000	62,759,000	62,524,000	59,971,000
Income (loss) from continuing operations, basic (in dollars per share)			$ (15.91)	$ 4.75
Income from discontinued operations (in dollars per share)			$ 0.09
Net income (loss) (in dollars per share)	$ (16.97)	$ 1.40	$ (15.82)	$ 4.75
Income (loss) from continuing operations, diluted (in dollars per share)			$ (15.91)	$ 4.72
Income from discontinued operations (in dollars per share)			$ 0.09
Net income (loss) (in dollars per share)	$ (16.97)	$ 1.39	$ (15.82)	$ 4.72
Anti-dilutive securities excluded from earnings per share calculation	291,517	38,083	224,240	32,086