Income Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 1,629	$ 4,050	$ 3,792
State and local	497	302	309
Foreign	24,175	19,051	21,099
Current income tax expense	26,301	23,403	25,200
Deferred:
Federal	113	(554)	113
State and local		(55)	9
Foreign	(270)	18	(1,496)
Deferred income tax (benefit)	(157)	(591)	(1,374)
Total income tax expense	$ 26,144	$ 22,812	$ 23,826