UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 28,672	$ 22,902	$ 37,632	$ 33,404
Other comprehensive income (loss):
Unrealized (losses) gains on available-for-sale securities (net of taxes of $11, $22, $141 and $92 respectively)	(61)	(166)	799	(715)
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $8, $0, $504 and $0 respectively)	(45)	0	(2,857)	0
Foreign currency translation adjustments	36,162	(35,340)	(3,411)	(58,652)
Other comprehensive income (loss)	36,056	(35,506)	(5,469)	(59,367)
Comprehensive income (loss)	$ 64,728	$ (12,604)	$ 32,163	$ (25,963)