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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |  |
NET INCOME | $ 40,776 | $ 14,788 | $ 51,963 | $ 23,158
Pension and other postretirement benefit plans: |  |  |  |
Net actuarial loss, net of tax of: (2018 – Three-month period $2,038, Nine-month period $689; 2017 – Three-month period $1,011, Nine-month period $2,010) | (5,877) | (1,589) | (1,987) | (3,158)
Pension settlement expense, net of tax of: (2018 – Three-month period $134, Nine-month period $413; 2017 – Three-month period $366, Nine-month period $1,417) | 384 | 577 | 1,190 | 2,227
Amortization of unrecognized net periodic benefit costs, net of tax of: (2018 – Three-month period $146, Nine-month period $536; 2017 – Three-month period $331, Nine-month period $1,084) |  |  |  |
Net actuarial loss | 438 | 547 | 1,598 | 1,788
Prior service credit | (17) | (29) | (52) | (87)
Interest rate swap and foreign currency translation: |  |  |  |
Change in unrealized income on interest rate swap, net of tax of: (2018 – Three-month period $59, Nine-month period $334; 2017 – Three-month period $16, Nine-month period $156) | 167 | 25 | 946 | 241
Change in foreign currency translation, net of tax of: (2018 – Three-month period $45, Nine month-period $58; 2017 – Three-month period $190, Nine-month period $132) | 127 | 294 | (165) | 205
OTHER COMPREHENSIVE INCOME (LOSS), net of tax | (4,778) | (175) | 1,530 | 1,216
TOTAL COMPREHENSIVE INCOME | $ 35,998 | $ 14,613 | $ 53,493 | $ 24,374

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