Income Taxes - Schedule of Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal									$ 8,002	$ 5,451	$ 4,304
Foreign									2,855	3,019	3,383
State and local									943	1,029	396
Total current expense									11,800	9,499	8,083
Deferred expense
Federal									3,222	2,333	1,741
Foreign									13	25	(5)
State and local									238	173	129
Total deferred expense									3,473	2,531	1,865
Provision for income tax expense	$ 3,097	$ 4,632	$ 4,285	$ 3,259	$ 3,148	$ 3,277	$ 3,457	$ 2,148	$ 15,273	$ 12,030	$ 9,948