Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 27,977	$ 22,120	$ 22,284
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments gains/(losses)	(2,514)	2,195	744
Defined benefit pension plans:
Net loss arising during the year	(273)	(1,286)	(1,219)
Amortization of defined benefit pension items:
Net actuarial loss	6,084	2,822	1,912
Prior service cost	62	38	(205)
Amortization of defined benefit pension items:	6,146	2,860	1,707
Defined benefit pension plan adjustments	(5,873)	(1,574)	(488)
Total other comprehensive income, net of tax	3,359	3,769	1,232
Comprehensive income	$ 31,336	$ 25,889	$ 23,516