Income Taxes - Schedule of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments [Abstract]
U.S. Federal, Current	$ 10,953	$ 15,105	$ 11,067
U.S. Federal, Deferred	3,466	(8,784)	(11,995)
U.S. Federal, Total	14,419	6,321	(928)
U.S. state and local, Current	2,032	1,636	1,119
U.S. state and local, Deferred	51	(524)	(761)
U.S. state and local, Total	2,083	1,112	358
Foreign jurisdictions, Current	1,576	710	1,372
Foreign jurisdictions, Deferred	(255)	389	41
Foreign jurisdictions, Total	1,321	1,099	1,413
Income tax provision (benefit), Current	14,561	17,451	13,558
Income tax provision (benefit), Deferred	3,262	(8,919)	(12,715)
Income tax provision (benefit), Total	$ 17,823	$ 8,532	$ 843