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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	$ 651,462	$ 599,055	$ 588,728
Adjusted Balances		651,878
OTHER COMPREHENSIVE INCOME, net of tax	9,912	2,843	4,079
Balances	717,682	651,462	599,055
Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	(20,574)	(23,417)	(27,496)
Adjusted Balances		(24,150)
Other comprehensive income (loss) before reclassifications	(1,821)	(1,968)
Amounts reclassified from accumulated other comprehensive loss	11,733	4,811
OTHER COMPREHENSIVE INCOME, net of tax	9,912	2,843	4,079
Balances	(14,238)	(20,574)	(23,417)
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	(1,376)	(2,640)
Amounts reclassified from accumulated other comprehensive loss	11,733	4,811
OTHER COMPREHENSIVE INCOME, net of tax	10,357	2,171
Balances	(12,749)	(19,715)	(21,886)
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	236	621
OTHER COMPREHENSIVE INCOME, net of tax	236	621
Balances	591	292	(329)
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	(681)	51
OTHER COMPREHENSIVE INCOME, net of tax	(681)	51
Balances	$ (2,080)	(1,151)	$ (1,202)
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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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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