Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data
Net revenues	$ 548,080	$ 167,492	$ 183,879	$ 159,978	$ 483,325	$ 142,008	$ 159,148	$ 137,099	$ 1,059,429	$ 921,580	$ 783,642
Gross profit	319,347	59,501	87,232	65,271	280,009	52,282	75,813	60,756	531,351	468,860	414,049
Net income/(loss)	$ 131,114	$ (63,077)	$ (23,777)	$ (45,103)	$ 99,650	$ (46,244)	$ (27,052)	$ (34,214)	$ (843)	$ (7,860)	$ 9,285
Net income/(loss) per common share:
Basic (in dollars per share)	$ 3.73	$ (1.73)	$ (0.63)	$ (1.19)	$ 2.59	$ (1.20)	$ (0.70)	$ (0.89)	$ (0.02)	$ (0.20)	$ 0.25
Diluted (in dollars per share)	$ 3.57	$ (1.73)	$ (0.63)	$ (1.19)	$ 2.51	$ (1.20)	$ (0.70)	$ (0.89)	$ (0.02)	$ (0.20)	$ 0.24