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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
NET INCOME $ 67,262 $ 59,726 $ 18,652
Pension and other postretirement benefit plans:      
Net actuarial loss, net of tax of: (2018 – $477; 2017 – $1,682; 2016 – $805) (1,376) (2,640) (1,267)
Pension settlement expense, net of tax of: (2018 – $3,327; 2017 – $1,617; 2016 –$1,256) 9,598 2,539 1,973
Amortization of unrecognized net periodic benefit costs, net of tax of: (2018 – $740; 2017 – $1,446; 2016 – $1,849)      
Net actuarial loss 2,204 2,388 3,021
Prior service credit (69) (116) (116)
Interest rate swap and foreign currency translation:      
Change in unrealized income (loss) on interest rate swap, net of tax of: (2018 – $84; 2017 – $402; 2016 – $139) 236 621 216
Change in foreign currency translation, net of tax of: (2018 – $241; 2017 – $33; 2016 – $149) (681) 51 252
OTHER COMPREHENSIVE INCOME, net of tax 9,912 2,843 4,079
TOTAL COMPREHENSIVE INCOME $ 77,174 $ 62,569 $ 22,731