Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 267,697	$ 170,804	$ 114,736	$ 118,029	$ 68,067	$ 69,252	$ 70,434	$ 55,000	$ 671,266	$ 262,753	$ 248,926
Operating Income (Loss)	129,458	53,454	18,110	25,109	2,926	15,137	22,456	14,944	226,131	55,463	97,263
Income tax expense recorded for continuing operations	67,757	4,876	31,461	49,247	21,027	23,400	25,514	28,195	153,341	98,136	26,363
Net income	$ 110,073	$ 6,920	$ 47,852	$ 82,558	$ 24,278	$ 40,527	$ 43,828	$ 44,559	$ 247,403	$ 153,192	$ 68,371
Basic net income per share	$ 1.29	$ 0.08	$ 0.56	$ 0.97	$ 0.30	$ 0.52	$ 0.57	$ 0.61	$ 2.90	$ 1.98	$ 1.22
Diluted net income per share	$ 1.28	$ 0.08	$ 0.56	$ 0.96	$ 0.30	$ 0.52	$ 0.56	$ 0.61	$ 2.88	$ 1.97	$ 1.21