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STOCKHOLDERS' EQUITY (AOCI comp) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances	$ 775,091	$ 759,206	$ 763,043	$ 743,159	$ 721,755	$ 717,682	$ 763,043	$ 717,682
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	723	174	(2,467)	4,799	(41)	1,850	(1,570)	6,608
Balances	802,639	775,091	759,206	763,626	743,159	721,755	802,639	763,626
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances	(2,090)	(2,264)	203	(12,429)	(12,388)	(14,238)	203	(14,238)
Other comprehensive income (loss) before reclassifications							(1,309)	(1,183)
Amounts reclassified from accumulated other comprehensive income (loss)							(261)	7,791
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	723	174	(2,467)	4,799	(41)	1,850	(1,570)	6,608
Balances	(1,367)	$ (2,090)	(2,264)	(7,630)	$ (12,429)	(12,388)	(1,367)	(7,630)
Unrecognized Net Periodic Benefit Credit (cost)
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances			2,152			(12,749)	2,152	(12,749)
Other comprehensive income (loss) before reclassifications							(8)	(291)
Amounts reclassified from accumulated other comprehensive income (loss)							(261)	7,791
OTHER COMPREHENSIVE INCOME (LOSS), net of tax							(269)	7,500
Balances	1,883			(5,249)			1,883	(5,249)
Interest Rate Swap
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances			(416)			591	(416)	591
Other comprehensive income (loss) before reclassifications							(1,035)	(1,198)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax							(1,035)	(1,198)
Balances	(1,451)			(607)			(1,451)	(607)
Foreign Currency Translation
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances			$ (1,533)			$ (2,080)	(1,533)	(2,080)
Other comprehensive income (loss) before reclassifications							(266)	306
OTHER COMPREHENSIVE INCOME (LOSS), net of tax							(266)	306
Balances	$ (1,799)			$ (1,774)			$ (1,799)	$ (1,774)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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