Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 126,673	$ 114,920	$ 103,637
Other comprehensive income, net of taxes:
Change in cumulative translation adjustment	9,975	9,922	(20,022)
Change in unrealized (loss) gain on available-for-sale securities	(15)	(14)	23
Change in minimum pension liability	267	(796)	0
Changes due to cash flow hedging instruments:
Net (loss) gain on hedge instruments	(2,492)	2,487	(910)
Reclassification to net income of previously deferred losses (gains) related to hedge derivatives instruments	837	2,502	(3,641)
Comprehensive income	$ 135,245	$ 129,021	$ 79,087