Other expense/(income), net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other expense/(income), net [Abstract]
Currency transactions	$ 2,174	$ (814)	$ 2,873	$ 2,564
Bank fees and amortization of debt issuance costs	605	263	1,814	789
Letter of credit fees	191	361	961	1,633
Other, net	99	181	(586)	(175)
Total	$ 3,069	$ (9)	$ 5,062	$ 4,811