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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges $ 2,367 $ 6 $ 2,255 $ (1,813)
Tax on foreign currency translation adjustments 0 0 0 0
Tax benefit (expense) on unrecognized pension (loss) gain 12 34 (24) 153
Tax benefit on unrealized (loss) on investments $ (22) $ (46) $ (39) $ (185)