Income Taxes - Schedule of Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 6,020	$ 6,084	$ 1,012
State	507	983	439
Foreign	3,159	838	3,425
Current Income Tax Expense (Benefit)	9,686	7,905	4,876
Deferred:
Federal	17,034	4,765	3,881
State	643	184	71
Foreign	(470)	62	28
Deferred Income Tax Expense (Benefit)	17,207	5,011	3,980
Total income tax expense	$ 26,893	$ 12,916	$ 8,856