CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 95,566	$ 129,674	$ 127,252
Other comprehensive (loss) income:
Unrealized gains on available-for-sale securities (net of taxes of $208, $177 and $174, respectively)	1,244	1,008	686
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $379)	0	0	(1,493)
Foreign currency translation adjustments	(70,791)	17,925	(18,264)
Unfunded pension liability (net of taxes of $123, $231 and $58, respectively)	359	(654)	(335)
Other comprehensive (loss) income	(69,188)	18,279	(19,406)
Comprehensive income	$ 26,378	$ 147,953	$ 107,846