Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax provision (benefit):
Federal	$ 3,801	$ (176)	$ 1,767
State	1,035	838	343
Foreign		2,081
Total current payable	4,836	2,743	2,110
Deferred tax provision (benefit):
Federal	66,430	4,697	34,728
State	5,239	371	2,738
Total deferred payable	71,669	5,068	37,466
Provision for income taxes	$ 76,505	$ 7,811	$ 39,576