Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax provision (benefit):
Federal	$ (176)	$ 1,767
State	838	343	441
Foreign	2,081
Total current payable	2,743	2,110	441
Deferred tax provision (benefit):
Federal	4,697	34,728	31,791
State	371	2,738	2,507
Total deferred payable	5,068	37,466	34,298
Provision for income taxes	$ 7,811	$ 39,576	$ 34,739