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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	$ 717,682	$ 651,462	$ 599,055
Adjusted Balances			651,878
OTHER COMPREHENSIVE INCOME, net of tax	14,441	9,912	2,843
Balances	763,043	717,682	651,462
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	(14,238)	(20,574)	(23,417)
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard			(3,576)
Adjusted Balances			(24,150)
Other comprehensive income (loss) before reclassifications	6,197	(1,821)
Amounts reclassified from accumulated other comprehensive loss	8,244	11,733
OTHER COMPREHENSIVE INCOME, net of tax	14,441	9,912	2,843
Balances	203	(14,238)	(20,574)
Unrecognized Net Periodic Benefit Credit (Costs)
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	(12,749)	(19,715)
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard			(3,391)
Adjusted Balances			(23,106)
Other comprehensive income (loss) before reclassifications	6,657	(1,376)
Amounts reclassified from accumulated other comprehensive loss	8,244	11,733
OTHER COMPREHENSIVE INCOME, net of tax	14,901	10,357
Balances	2,152	(12,749)	(19,715)
Interest Rate Swap, 2019
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	591
Other comprehensive income (loss) before reclassifications	(1,007)
OTHER COMPREHENSIVE INCOME, net of tax	(1,007)
Balances	(416)	591
Interest Rate Swap, 2018 and 2017
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	591	292
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard			63
Adjusted Balances			355
Other comprehensive income (loss) before reclassifications		236
OTHER COMPREHENSIVE INCOME, net of tax		236
Balances		591	292
Foreign Currency Translation
Changes in accumulated other comprehensive loss, net of tax, by component
Balances	(2,080)	(1,151)
Adjustment to beginning balance of accumulated other comprehensive loss for adoption of accounting standard			(248)
Adjusted Balances			(1,399)
Other comprehensive income (loss) before reclassifications	547	(681)
OTHER COMPREHENSIVE INCOME, net of tax	547	(681)
Balances	$ (1,533)	$ (2,080)	$ (1,151)

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

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