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Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Tax (benefit) expense on changes in value of financial instruments designated as cash flow hedges $ (85) $ 144 $ 551
Tax on foreign currency translation adjustments 0 0 0
Tax benefit on unrealized loss on investments $ (58) $ (55) $ (355)