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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Tax benefit on changes in value of financial instruments designated as cash flow hedges $ 1,041 $ 133
Tax on foreign currency translation adjustments 0 0
Tax expense on unrealized gain (loss) on investments $ 254 $ 54