CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) [Abstract]
Net income	$ 9,680	$ 11,774	$ 19,799	$ 33,644
Other comprehensive (loss)/income, before tax:
Foreign currency translation adjustments	(17,683)	(27,765)	(42,581)	(29,705)
Amortization of pension liability adjustment:
Prior service credit	(1,110)	(1,108)	(3,330)	(3,325)
Net actuarial loss	1,462	1,343	4,428	4,026
Payments related to derivatives included in earnings	587	480	1,540	1,431
Derivative valuation adjustment	(2,672)	446	(3,892)	(869)
Income taxes related to items of other comprehensive income/(loss):
Amortization of pension liability adjustment	(123)	(94)	(384)	(280)
Payments related to derivatives included in earnings	(229)	(187)	(601)	(558)
Derivative valuation adjustment	1,042	(174)	1,518	339
Comprehensive (loss)/income	(9,046)	(15,285)	(23,503)	4,703
Comprehensive income/(loss) attributable to the noncontrolling interest	22	(31)	101	1
Comprehensive income/(loss) attributable to the Company	$ (9,068)	$ (15,254)	$ (23,604)	$ 4,702