Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 57,217	$ 57,303	$ 25,915
Foreign currency translation adjustments:
Unrealized net change arising during the period	(16,424)	(25,800)	$ 4,813
Reclassification adjustments for losses included in net income	1,954	4,400
Interest rate swap agreement:
Unrealized net losses	(30)	(152)	$ (130)
Reclassification adjustments for losses included in net income	333	465	444
Income taxes	(110)	(109)	(110)
Actuarial gain/(loss)
Actuarial gain/(loss) arising during the period	3,970	(18,338)	13,651
Amortization to net income of net actuarial loss	1,295	802	1,339
Prior service cost
Amortization to net income of net prior service cost	$ 52	50	$ 50
Lump-sum pension payout		7,170
Income taxes	$ (1,508)	5,493	$ (4,928)
Comprehensive income	$ 46,749	$ 31,284	$ 41,044