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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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 INCOME | $ 16,270 | $ 40,776 | $ 45,534 | $ 51,963
Pension and other postretirement benefit plans: |  |  |  |
Net actuarial loss, net of tax of: (2019 - Three-month period $310, Nine-month period $100; 2018 - Three-month period $2,038, Nine-month period $689) | (894) | (5,877) | (291) | (1,987)
Pension settlement expense, including termination expense, net of tax of: (2019 - Three-month period $651, Nine-month period $1,072; 2018 - Three-month period $134, Nine-month period $413) | 5,850 | 384 | 7,063 | 1,190
Amortization of unrecognized net periodic benefit costs, net of tax of: (2019 - Three-month period $75, Nine-month period $252; 2018 - Three-month period $146, Nine-month period $536) |  |  |  |
Net actuarial loss | 222 | 438 | 746 | 1,598
Prior service credit | (6) | (17) | (18) | (52)
Interest rate swap and foreign currency translation: |  |  |  |
Change in unrealized income (loss) on interest rate swap, net of tax of: (2019 - Three-month period $120, Nine-month period $425) | (338) |  | (1,198) |
Change in unrealized income (loss) on interest rate swap, net of tax of: (2018 - Three-month period $59, Nine-month period $334) |  | 167 |  | 946
Change in foreign currency translation, net of tax of: (2019 - Three-month period $12, Nine-month period $108; 2018 - Three-month period $45, Nine-month period $58) | (35) | 127 | 306 | (165)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax | 4,799 | (4,778) | 6,608 | 1,530
TOTAL COMPREHENSIVE INCOME | $ 21,069 | $ 35,998 | $ 52,142 | $ 53,493

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