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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges $ (227) $ 2,367 $ (212) $ 2,255
Tax on foreign currency translation adjustments 0 0 0 0
Tax (benefit) expense on unrecognized pension loss (1) 12 20 (24)
Tax benefit on unrealized loss on investments $ (30) $ (22) $ (46) $ (39)