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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME        
Net actuarial loss, tax expense (benefit) $ (20) $ 450 $ 210 $ 1,349
Pension settlement expense, tax 72 111 421 279
Amortization of unrecognized net periodic benefit costs, tax 77 171 177 390
Change in unrealized income (loss) on interest rate swap, tax (benefit) (187)   (305)  
Change in unrealized income (loss) on interest rate swap, tax expense   7   275
Change in foreign currency translation, tax expense (benefit) $ 41 $ (78) $ 120 $ (103)