Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Data [Abstract]
Net revenues	$ 351,777	$ 98,536	$ 99,020	$ 91,291	$ 263,754	$ 76,523	$ 75,764	$ 57,229	$ 640,624	$ 473,270	$ 307,707
Gross profit	212,812	43,407	48,310	41,238	155,286	34,876	35,883	27,683	345,767	253,728	173,216
Net income (loss)	$ 53,027	$ (10,478)	$ (9,511)	$ (10,040)	$ 35,411	$ (9,953)	$ (3,650)	$ (7,760)	$ 22,998	$ 14,048	$ 17,127
Net income (loss) per common share:
Basic (in dollars per share)	$ 1.46	$ (0.29)	$ (0.27)	$ (0.29)	$ 1.02	$ (0.29)	$ (0.11)	$ (0.27)	$ 0.64	$ 0.43	$ 0.63
Diluted (in dollars per share)	$ 1.40	$ (0.29)	$ (0.27)	$ (0.29)	$ 0.97	$ (0.29)	$ (0.11)	$ (0.27)	$ 0.61	$ 0.40	$ 0.59