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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME |  |  |  |
NET INCOME | $ 1,233 | $ 15,777 | $ 11,187 | $ 8,370
Pension and other postretirement benefit plans: |  |  |  |
Net actuarial gain (loss), net of tax of: (2018 – Three-month period $450, Six-month period $1,349; 2017 – Three-month period $64, Six-month period $999) | 1,300 | (98) | 3,890 | (1,569)
Pension settlement expense, net of tax of: (2018 – Three-month period $111, Six-month period $279; 2017 – Three-month period $290, Six-month period $1,051) | 320 | 454 | 806 | 1,650
Amortization of unrecognized net periodic benefit costs, net of tax of: (2018 – Three-month period $171, Six-month period $390; 2017 – Three-month period $352, Six-month period $753) |  |  |  |
Net actuarial loss | 511 | 581 | 1,160 | 1,241
Prior service credit | (18) | (29) | (35) | (58)
Interest rate swap and foreign currency translation: |  |  |  |
Change in unrealized income on interest rate swap, net of tax of: (2018 – Three-month period $7, Six-month period $275; 2017 – Three-month period $52, Six-month period $140) | 343 | 81 | 779 | 216
Change in foreign currency translation, net of tax of: (2018 – Three-month period $78, Six month-period $103; 2017 – Three-month period $134, Six-month period $58) | (220) | (208) | (292) | (89)
OTHER COMPREHENSIVE INCOME, net of tax | 2,236 | 781 | 6,308 | 1,391
TOTAL COMPREHENSIVE INCOME | $ 3,469 | $ 16,558 | $ 17,495 | $ 9,761

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