OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension and postretirement benefits [Abstract]
Amortization of net actuarial loss, Gross Amount	[1]	$ 1,193	$ 1,740	$ 3,575	$ 5,226
Amortization of net actuarial loss, Income Tax (Provision) Benefit	[1]	(455)	(668)	(1,367)	(2,000)
Amortization of net actuarial loss, Net Amount	[1]	738	1,072	2,208	3,226
Actuarial gains (losses), Gross Amount	[1]	(2)	2	(6,437)	2,295
Actuarial gains (losses), Income Tax (Provision) Benefit	[1]	(1)	0	2,464	(881)
Actuarial gains (losses), Net Amount	[1]	(3)	2	(3,973)	1,414
Foreign currency translation adjustments, Gross Amount		0	49	0	81
Foreign currency translation adjustments, Income Tax (Provision) Benefit		0	0	0	0
Foreign currency translation adjustments, Net Amount		0	49	0	81
Total other comprehensive income (loss), Gross Amount		1,191	1,791	(2,862)	7,602
Total other comprehensive income (loss), Income Tax (Provision) Benefit		(456)	(668)	1,097	(2,881)
Total other comprehensive income (loss), net of taxes		$ 735	$ 1,123	$ (1,765)	$ 4,721

[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)