OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Pension and postretirement benefits [Abstract]
Amortization of net actuarial loss, Gross Amount	[1]	$ 1,688	$ (2)	$ 3,486		$ 35
Amortization of net actuarial loss, Income Tax (Provision) Benefit	[1]	(642)	0	(1,332)		(13)
Amortization of net actuarial loss, Net Amount	[1]	1,046	(2)	2,154		22
Actuarial gains, Gross Amount	[1]	2,293	721	2,293		721
Actuarial gains, Income Tax (Provision) Benefit	[1]	(881)	(275)	(881)		(275)
Actuarial gains, Net Amount	[1]	1,412	446	1,412		446
Foreign currency translation adjustments, Gross Amount		129	9	32	[1]	(8)	[1]
Foreign currency translation adjustments, Income Tax (Provision) Benefit		0	0	0	[1]	0	[1]
Foreign currency translation adjustments, Net Amount		129	9	32		(8)
Change in fair value of derivative instruments [Abstract]
Reclassified to net earnings, Gross Amount	[2]	0	0	0		146
Reclassified to net earnings, Income Tax (Provision) Benefit	[2]	0	0	0		(62)
Reclassified to net earnings, Net Amount	[2]	0	0	0		84
Total other comprehensive income (loss), Gross Amount		4,110	728	5,811	[2]	894	[2]
Total other comprehensive income (loss), Income Tax (Provision) Benefit		(1,523)	(275)	(2,213)	[2]	(350)	[2]
Total comprehensive income, net of taxes		$ 2,587	$ 453	$ 3,598		$ 544

[1] Actuarial gains (losses) are amortized into costs of sales and operating expenses or selling, general and administrative expenses as appropriate. (See Note 10 - Retirement Plans)

[2] Reclassifications to net earnings of derivatives qualifying as effective hedges are recognized in costs of sales and operating expenses.