Net Income (Loss) Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Income (Loss) Per Common Share [Abstract]
Net income (loss)	$ (15,780)	$ (5,679)	$ (24,582)	$ 93,138
Denominator for basic net income (loss) per share	55,786,617	54,056,064	55,670,598	53,706,617
Net effect of dilutive common stock equivalents				2,176,000
Denominator for diluted net income (loss) per share:	55,786,617	54,056,064	55,670,598	55,883,346
Basic net income (loss) per share	$ (0.28)	$ (0.11)	$ (0.44)	$ 1.73
Diluted net income (loss) per share	$ (0.28)	$ (0.11)	$ (0.44)	$ 1.67
Total number of antidilutive common stock equivalents excluded from the net income per share computation		4,000,000	5,500,000	800,000