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STOCKHOLDERS' EQUITY (AOCI) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss)
Total after-tax amount	$ 802,639	$ 775,091	$ 759,206	$ 763,043	$ 763,626	$ 743,159	$ 721,755	$ 717,682
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Total pre-tax amount	(1,864)			260
Total after-tax amount	(1,367)	$ (2,090)	$ (2,264)	203	(7,630)	$ (12,429)	$ (12,388)	(14,238)
Unrecognized Net Periodic Benefit Credit (cost)
Accumulated Other Comprehensive Income (Loss)
Total pre-tax amount	2,535			2,898
Total after-tax amount	1,883			2,152	(5,249)			(12,749)
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss)
Total pre-tax amount	(1,964)			(563)
Total after-tax amount	(1,451)			(416)	(607)			591
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss)
Total pre-tax amount	(2,435)			(2,075)
Total after-tax amount	$ (1,799)			$ (1,533)	$ (1,774)			$ (2,080)

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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