CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) [Abstract]
Net income/(loss)	$ (2,120)	$ 11,177	$ 10,119	$ 21,870
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments	10,785	3,289	(24,898)	(1,940)
Amortization of pension liability adjustment:
Prior service credit	(1,111)	(1,108)	(2,220)	(2,217)
Net actuarial loss	1,461	1,355	2,966	2,683
Payments related to derivatives included in earnings	467	473	953	951
Derivative valuation adjustment	(113)	(955)	(1,220)	(1,315)
Income taxes related to items of other comprehensive income/(loss):
Amortization of pension liability adjustment	(122)	(98)	(261)	(186)
Payments related to derivatives included in earnings	(182)	(184)	(372)	(371)
Derivative valuation adjustment	44	372	476	513
Comprehensive income/(loss)	9,109	14,321	(14,457)	19,988
Net income/(loss) attributable to the noncontrolling interest	52	(42)	79	30
Comprehensive income/(loss) attributable to the Company	$ 9,057	$ 14,363	$ (14,536)	$ 19,958