Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Financial Data (Unaudited) [Abstract]
Net revenues	$ 263,754	$ 76,523	$ 75,764	$ 57,229	$ 166,200	$ 48,958	$ 46,807	$ 45,742	$ 473,270	$ 307,707	$ 246,432
Gross profit	155,296	34,876	35,883	27,683	102,372	24,052	23,628	23,164	253,728	173,216	134,784
Net income (loss)	$ 35,411	$ (9,953)	$ (3,650)	$ (7,760)	$ 32,513	$ (4,770)	$ (5,885)	$ (4,731)	$ 14,048	$ 17,127	$ 5,853
Net income (loss) per common share [Abstract]
Basic (in dollars per share)	$ 1.02	$ (0.29)	$ (0.11)	$ (0.27)	$ 1.18	$ (0.17)	$ (0.22)	$ (0.18)	$ 0.43	$ 0.63	$ 0.23
Diluted (in dollars per share)	$ 0.97	$ (0.29)	$ (0.11)	$ (0.27)	$ 1.09	$ (0.17)	$ (0.22)	$ (0.18)	$ 0.40	$ 0.59	$ 0.22