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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
NET INCOME (LOSS) $ 59,726 $ 18,652 $ 44,854
Pension and other postretirement benefit plans:      
Net actuarial loss, net of tax of: (2017 – $1,682; 2016 – $805; 2015 – $4,798) (2,640) (1,267) (7,535)
Pension settlement expense, net of tax of: (2017 – $1,617; 2016 – $1,256; 2015 – $1,246) 2,539 1,973 1,956
Amortization of unrecognized net periodic benefit costs, net of tax of: (2017 – $1,446; 2016 – $1,849; 2015 – $1,571)      
Net actuarial loss 2,388 3,021 2,585
Prior service credit (116) (116) (116)
Interest rate swap and foreign currency translation:      
Change in unrealized income (loss) on interest rate swap, net of tax of: (2017 – $402; 2016 – $139; 2015 – $126) 621 216 (195)
Change in foreign currency translation, net of tax of: (2017 – $33; 2016 – $149; 2015 – $451) 51 252 (712)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax 2,843 4,079 (4,017)
TOTAL COMPREHENSIVE LOSS $ 62,569 $ 22,731 $ 40,837