Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 11,168	$ 7,038
Other comprehensive income/(loss):
Foreign currency translation adjustments	(3,836)	5,973
Comprehensive income (loss)	7,620	12,765
Foreign Currency Forward Contracts [Member]
Other comprehensive income/(loss):
Derivatives net of tax	0	(165)
Interest Rate Swap Agreement [Member]
Other comprehensive income/(loss):
Derivatives net of tax	56	(380)
Pension Plan [Member]
Other comprehensive income/(loss):
Pension plan amortization of net actuarial loss and prior service cost, net of tax	$ 232	$ 299