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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 26,628	$ 23,893	$ 59,784	$ 66,820
Other comprehensive income (loss), net of applicable taxes:
Foreign currency translation adjustment	269	(597)	(567)	(1,649)
Less: reclassification adjustment for translation gain included in other income	0	280	0	280
Foreign currency translation adjustment, net	269	(317)	(567)	(1,369)
Unrealized gain (loss) on short-term investments	10	(21)	16	(35)
Total other comprehensive income (loss)	279	(338)	(551)	(1,404)
Comprehensive income	$ 26,907	$ 23,555	$ 59,233	$ 65,416

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