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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges $ (242) $ 49 $ (2,635) $ 2,304
Tax on foreign currency translation adjustments 0 0 0 0
Tax (benefit) expense on unrecognized pension loss 31 7 51 (17)
Tax benefit on unrealized loss on investments $ 6 $ 17 $ (40) $ (22)