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OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Pension and postretirement benefits [Abstract]        
Amortization of net actuarial loss, Gross Amount [1] $ 908 $ 1,345 $ 2,117 $ 2,382
Amortization of net actuarial loss, Income Tax (Provision) Benefit [1] (347) (524) (810) (912)
Amortization of net actuarial loss, Net Amount [1] 561 821 1,307 1,470
Actuarial gains (losses), Gross Amount [1] 22,014 (6,435) 22,014 (6,435)
Actuarial gains (losses), Income Tax (Provision) Benefit [1] (8,435) 2,465 (8,435) 2,465
Actuarial gains (losses), Net Amount [1] 13,579 (3,970) 13,579 (3,970)
Total other comprehensive income (loss), Gross Amount 22,922 (5,090) 24,131 (4,053)
Total other comprehensive income (loss), Income Tax (Provision) Benefit (8,782) 1,941 (9,245) 1,553
Total other comprehensive income (loss), net of taxes $ 14,140 $ (3,149) $ 14,886 $ (2,500)
[1] Actuarial gains/(losses) are amortized into costs of sales and operating expenses or selling, general and administrative expenses as appropriate. (See Note 12 - Retirement Plans)