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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME    
Net actuarial loss, tax expense (benefit) $ 230 $ 899
Pension settlement expense, tax 349 168
Amortization of unrecognized net periodic benefit costs, tax 100 219
Change in unrealized income (loss) on interest rate swap, tax (benefit) (118)  
Change in unrealized income (loss) on interest rate swap, tax expense   219
Change in foreign currency translation, tax expense (benefit) $ 79 $ (223)