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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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 INCOME | $ 39,985 | $ 67,262 | $ 59,726
Pension and other postretirement benefit plans: |  |  |
Net actuarial gain (loss), net of tax of: (2019 - $2,308; 2018 - $477; 2017 - $1,682) | 6,657 | (1,376) | (2,640)
Pension settlement expense, including termination expense, net of tax of: (2019 - $1,167; 2018 - $3,327; 2017 - $1,617) | 7,338 | 9,598 | 2,539
Amortization of unrecognized net periodic benefit costs, net of tax of: (2019 - $314; 2018 - $740; 2017 - $1,446) |  |  |
Net actuarial loss | 931 | 2,204 | 2,388
Prior service credit | (25) | (69) | (116)
Interest rate swap and foreign currency translation: |  |  |
Change in unrealized income (loss) on interest rate swap, net of tax of:(2019 - $357) | (1,007) |  |
Change in unrealized income (loss) on interest rate swap, net of tax of:(2018 - $84; 2017 - $402) |  | 236 | 621
Change in foreign currency translation, net of tax of: (2019 - $194; 2018 - $241; 2017 - $33) | 547 | (681) | 51
OTHER COMPREHENSIVE INCOME, net of tax | 14,441 | 9,912 | 2,843
TOTAL COMPREHENSIVE INCOME | $ 54,426 | $ 77,174 | $ 62,569

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