Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 53,115	$ 2,689
Other comprehensive income (loss):
Foreign currency translation adjustments	461	(2,289)
Change in unrealized gains (losses) on available-for-sale securities, net of tax of $291 and $(212), respectively	467	(339)
Total other comprehensive income (loss)	928	(2,628)
Comprehensive income	$ 54,043	$ 61