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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Tax benefit on changes in value of financial instruments designated as cash flow hedges $ 112 $ 1,831
Tax on foreign currency translation adjustments 0 0
Tax benefit (expense) on unrecognized pension (loss) gain 36 (86)
Tax benefit on unrealized (loss) on investments $ 17 $ 94