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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	$ 651,462
Adjusted Balances			$ 651,878
OTHER COMPREHENSIVE INCOME, net of tax	4,072	$ 610
Balances	665,474
Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	(20,574)	(23,417)
Adjusted Balances			(24,150)
Other comprehensive income (loss) before reclassifications	2,954	(1,217)
Amounts reclassified from accumulated other comprehensive loss	1,118	1,827
OTHER COMPREHENSIVE INCOME, net of tax	4,072	610
Balances	(20,078)	(22,807)
Unrecognized Net Periodic Benefit Costs
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	(19,715)	(21,886)
Adjusted Balances			(23,106)
Other comprehensive income (loss) before reclassifications	2,590	(1,471)
Amounts reclassified from accumulated other comprehensive loss	1,118	1,827
OTHER COMPREHENSIVE INCOME, net of tax	3,708	356
Balances	(19,398)	(21,530)
Interest Rate Swap
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	292	(329)
Adjusted Balances			355
Other comprehensive income (loss) before reclassifications	436	135
OTHER COMPREHENSIVE INCOME, net of tax	436	135
Balances	791	(194)
Foreign Currency Translation
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	(1,151)	(1,202)
Adjusted Balances			(1,399)
Other comprehensive income (loss) before reclassifications	(72)	119
OTHER COMPREHENSIVE INCOME, net of tax	(72)	119
Balances	$ (1,471)	$ (1,083)
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive loss, net of tax, by component
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard(			(3,576)
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Unrecognized Net Periodic Benefit Costs
Changes in accumulated other comprehensive loss, net of tax, by component
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard(			(3,391)
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Interest Rate Swap
Changes in accumulated other comprehensive loss, net of tax, by component
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard(			63
ASC Topic 220, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Foreign Currency Translation
Changes in accumulated other comprehensive loss, net of tax, by component
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard(			$ (248)

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Amount of stockholders' equity after the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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