Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 122,641	$ 266,799	$ 112,403
Other comprehensive income (loss):
Foreign currency translation adjustments	(37,887)	(7,768)	1,772
Change in unrealized gains (losses) on available-for-sale securities, net of tax of $(598), $(156), and $(697), respectively	(975)	(253)	(1,116)
Total other comprehensive income (loss)	(38,862)	(8,021)	656
Comprehensive income	$ 83,779	$ 258,778	$ 113,059