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OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pension and postretirement benefits [Abstract]
Amortization of net actuarial loss, Gross Amount	[1]	$ 580	$ 822	$ 1,739	$ 2,939
Amortization of net actuarial loss, Income Tax (Provision) Benefit	[1]	(142)	(315)	(423)	(1,125)
Amortization of net actuarial loss, Net Amount	[1]	438	507	1,316	1,814
Actuarial gains (losses), Gross Amount	[1]			(609)	22,014
Actuarial gains (losses), Income Tax (Provision) Benefit	[1]			148	(8,435)
Actuarial gains (losses), Net Amount	[1]			(461)	13,579
Foreign currency translation, Gross Amount		(60)	(164)	(69)	(164)
Foreign currency translation, Income Tax (Provision) Benefit		0	0	0	0
Foreign currency translation, Net Amount		(60)	(164)	(69)	(164)
Total other comprehensive income (loss), Gross Amount		520	658	1,061	24,789
Total other comprehensive income (loss), Income Tax (Provision) Benefit		(142)	(315)	(8,200)	(9,560)
Total other comprehensive income (loss), net of taxes		$ 378	$ 343	(7,139)	15,229
ASU 2018-02 [Member]
Pension and postretirement benefits [Abstract]
Adoption of ASU 2018-02 - reclassification to retained earnings, Gross Amount				0	0
Adoption of ASU 2018-02 - reclassification to retained earnings, Income Tax (Provision) Benefit				(7,925)	0
Adoption of ASU 2018-02 - reclassification to retained earnings, Net Amount				$ (7,925)	$ 0
[1] Actuarial gains/(losses) are amortized into other income (expense). (See Note 13 - Retirement Plans)

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