CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income/(loss)	$ 10,101	$ (2,120)	$ 23,417	$ 10,119
Other comprehensive income/(loss), before tax:
Foreign currency translation adjustments	(10,126)	10,785	2,615	(24,898)
Pension/postretirement plan remeasurement			(170)
Amortization of pension liability adjustments:
Prior service credit	(1,112)	(1,111)	(2,225)	(2,220)
Net actuarial loss	1,296	1,461	2,574	2,966
Payments related to derivatives included in earnings	305	467	586	953
Derivative valuation adjustment	(4,581)	(113)	(7,433)	(1,220)
Income taxes related to items of other comprehensive income/(loss):
Pension/postretirement plan remeasurement			65
Amortization of pension liability adjustment	(56)	(122)	(105)	(261)
Payments related to derivatives included in earnings	(116)	(182)	(223)	(372)
Derivative valuation adjustment	1,741	44	2,825	476
Comprehensive income/(loss)	(2,548)	9,109	21,926	(14,457)
Comprehensive (loss)/income attributable to the noncontrolling interest	(264)	52	(452)	79
Comprehensive income/(loss) attributable to the Company	$ (2,284)	$ 9,057	$ 22,378	$ (14,536)