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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME        
Net actuarial loss, tax expense (benefit) $ (310) $ (2,038) $ (100) $ (689)
Pension settlement expense, including termination expense, tax 651 134 1,072 413
Amortization of unrecognized net periodic benefit costs, tax 75 146 252 536
Change in unrealized income (loss) on interest rate swap, tax (benefit) (120)   (425)  
Change in unrealized income (loss) on interest rate swap, tax expense   59   334
Change in foreign currency translation, tax expense (benefit) $ (12) $ 45 $ 108 $ (58)