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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges $ 15 $ (112)
Tax on foreign currency translation adjustments 0 0
Tax benefit on unrecognized pension loss 21 36
Tax benefit on unrealized loss on investments $ 16 $ 17