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OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension and postretirement benefits [Abstract]        
Amortization of net actuarial loss, Gross Amount [1] $ 1,345 $ 1,688 $ 2,382 $ 3,486
Amortization of net actuarial loss, Income Tax (Provision) Benefit [1] (524) (642) (912) (1,332)
Amortization of net actuarial loss, Net Amount [1] 821 1,046 1,470 2,154
Actuarial gains (losses), Gross Amount [1] (6,435) 2,293 (6,435) 2,293
Actuarial gains (losses), Income Tax (Provision) Benefit [1] 2,465 (881) 2,465 (881)
Actuarial gains (losses), Net Amount [1] (3,970) 1,412 (3,970) 1,412
Foreign currency translation adjustments, Gross Amount 0 129 0 32
Foreign currency translation adjustments, Income Tax (Provision) Benefit 0 0 0 0
Foreign currency translation adjustments, Net Amount 0 129 0 32
Total other comprehensive income (loss), Gross Amount (5,090) 4,110 (4,053) 5,811
Total other comprehensive income (loss), Income Tax (Provision) Benefit 1,941 (1,523) 1,553 (2,213)
Total other comprehensive income (loss), net of taxes $ (3,149) $ 2,587 $ (2,500) $ 3,598
[1] Actuarial gains (losses) are amortized into costs of sales and operating expenses or selling, general and administrative expenses as appropriate. (See Note 11 - Retirement Plans)