Net Income (Loss) Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Income (loss) from continuing operations	$ (359,003)	$ (1,065,555)	$ 363,598
Income from discontinued operations		$ 5,180
Denominator:
Average number of common shares outstanding, Basic	62,564,000	62,536,000	60,257,000
Effect of dilutive securities:
Stock awards and warrants			354,000
Weighted average shares, diluted	62,564,000	62,536,000	60,611,000
Income (loss) from continuing operations (in dollars per share)	$ (5.74)	$ (17.04)	$ 6.03
Income from discontinued operations (in dollars per share)		$ 0.08
Net income (loss) (in dollars per share)	$ (5.74)	$ (16.96)	$ 6.03
Income (loss) from continuing operations (in dollars per share)	$ (5.74)	$ (17.04)	$ 6.00
Income from discontinued operations (in dollars per share)		$ 0.08
Net income (loss) (in dollars per share)	$ (5.74)	$ (16.96)	$ 6.00
Effect of dilutive securities (in shares)	0	0
Anti-dilutive securities excluded from earnings per share calculation	539,682	238,210	31,511