CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 129,674	$ 127,252	$ 130,515
Unrealized gains (losses) on available-for-sale securities (net of taxes of $177, $174 and $59, respectively)	1,008	686	(551)
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $379)	0	(1,493)	0
Foreign currency translation adjustments	17,925	(18,264)	24,536
Unfunded pension liability (net of taxes of $231, $58 and $24, respectively)	(654)	(335)	(55)
Other comprehensive income (loss)	18,279	(19,406)	23,930
Comprehensive income	$ 147,953	$ 107,846	$ 154,445