CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income/(loss)	$ 11,177	$ (7,379)	$ 21,870	$ 4,132
Other comprehensive income, before tax:
Foreign currency translation adjustments	3,289	(2,647)	(1,940)	(13,269)
Amortization of pension liability adjustment:
Transition obligation		17		34
Prior service (credit)/cost	(1,108)	(909)	(2,217)	(1,817)
Net actuarial loss	1,355	1,664	2,683	3,328
Payments related to interest rate swaps included in earnings	473	454	951	910
Derivative valuation adjustment	(955)	1,960	(1,315)	1,961
Income taxes related to items of other comprehensive income:
Amortization of pension liability adjustment	(98)	(271)	(186)	(541)
Payments related to interest rate swaps included in earnings	(184)	(177)	(371)	(354)
Derivative valuation adjustment	372	(764)	513	(765)
Comprehensive income/(loss)	14,321	(8,052)	19,988	(6,381)
Comprehensive income attributable to the noncontrolling interest
Comprehensive income/(loss) attributable to the Company	$ 14,321	$ (8,052)	$ 19,988	$ (6,381)