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STOCKHOLDERS' EQUITY - AOCI components (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances	$ 851,909	$ 828,593	$ 759,206	$ 763,043	$ 828,593	$ 763,043
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	678	804	174	(2,467)	1,482	(2,293)
Balances	898,134	851,909	775,091	759,206	898,134	775,091
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances	1,994	1,190	(2,264)	203	1,190	203
Other comprehensive income (loss) before reclassifications					1,682	(2,142)
Amounts reclassified from accumulated other comprehensive income (loss)					(200)	(151)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax	678	804	174	(2,467)	1,482	(2,293)
Balances	2,672	1,994	(2,090)	(2,264)	2,672	(2,090)
Unrecognized Net Periodic Benefit Credit
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances		3,260		2,152	3,260	2,152
Other comprehensive income (loss) before reclassifications						(8)
Amounts reclassified from accumulated other comprehensive income (loss)					(200)	(151)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax					(200)	(159)
Balances	3,060		1,993		3,060	1,993
Interest Rate Swap
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances		(1,198)		(416)	(1,198)	(416)
Other comprehensive income (loss) before reclassifications					741	(1,171)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax					741	(1,171)
Balances	(457)		(1,587)		(457)	(1,587)
Foreign Currency Translation
Changes in accumulated other comprehensive income (loss), net of tax, by component
Balances		$ (872)		$ (1,533)	(872)	(1,533)
Other comprehensive income (loss) before reclassifications					941	(963)
OTHER COMPREHENSIVE INCOME (LOSS), net of tax					941	(963)
Balances	$ 69		$ (2,496)		$ 69	$ (2,496)

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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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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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