Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustment, tax benefit (expense)	$ 266	$ 132	$ (50)
Unrealized gain (loss) on available-for-sale securities, tax benefit (expense)	$ 71	$ (76)	$ 223