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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |
Net actuarial gain (loss), tax expense (benefit) | $ 2,308 | $ (477) | $ (1,682)
Pension settlement expense, including termination expense, tax | 1,167 | 3,327 | 1,617
Amortization of unrecognized net periodic benefit costs, tax | 314 | 740 | 1,446
Change in unrealized income (loss) on interest rate swap, tax (benefit) | (357) |  |
Change in unrealized income (loss) on interest rate swap, tax expense |  | 84 | 402
Change in foreign currency translation, tax expense (benefit) | $ 194 | $ (241) | $ 33

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