Net Loss Per 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 (Loss) Income [Abstract]
Net (loss) income basic and diluted	$ (10,720)	$ 55,486	$ (23,806)	$ 32,559
Weighted Average Common Shares (Denominator) Abstract
Shares outstanding, basic (in shares)	33,798,000	33,510,000	33,779,000	33,397,000
Dilutive effect of stock options	0	257,000	0	150,000
Dilutive effect of restricted stock	0	20,000	0	20,000
Shares outstanding, diluted (in shares)	33,798,000	33,787,000	33,779,000	33,567,000
Per share [Abstract]
Net income (loss) per share, basic (in dollars per share)	$ (0.32)	$ 1.66	$ (0.70)	$ 0.97
Net income (loss) per share, diluted (in dollars per share)	$ (0.32)	$ 1.64	$ (0.70)	$ 0.97
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unvested restricted stock (in shares)	33	120	33	120
Weighted Average Number (in shares)	6,301	3,703	6,096	3,762
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number (in shares)	6,227	3,703	6,011	3,762
Weighted Average Exercise Price (in dollars per share)	$ 12.26	$ 16.91	$ 12.35	$ 16.72
Restricted stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number (in shares)	74	0	85	0