Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ 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
Current expense (benefit):
Federal									$ (17)	$ 1,316	$ (747)
State									747	768	333
Foreign									3,218	2,644	2,324
Total current expense									3,948	4,728	1,910
Deferred expense (benefit):
Federal									3,250	4,078	1,089
State									294	(119)	278
Foreign									(94)	(89)	(8)
Total deferred expense									3,450	3,870	1,359
Total income tax expense	$ 145	$ 1,842	$ 3,122	$ 2,289	$ 3,680	$ 2,489	$ 1,366	$ 1,063	$ 7,398	$ 8,598	$ 3,269