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STOCKHOLDERS' EQUITY - AOCI (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income
Total after-tax amount	$ 898,134	$ 851,909	$ 828,593	$ 775,091	$ 759,206	$ 763,043
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income
Total pre-tax amount	3,595		1,586
Total after-tax amount	2,672	$ 1,994	1,190	(2,090)	$ (2,264)	203
Unrecognized Net Periodic Benefit Credit
Accumulated Other Comprehensive Income
Total pre-tax amount	4,121		4,390
Total after-tax amount	3,060		3,260	1,993		2,152
Interest Rate Swap
Accumulated Other Comprehensive Income
Total pre-tax amount	(618)		(1,622)
Total after-tax amount	(457)		(1,198)	(1,587)		(416)
Foreign Currency Translation
Accumulated Other Comprehensive Income
Total pre-tax amount	92		(1,182)
Total after-tax amount	$ 69		$ (872)	$ (2,496)		$ (1,533)

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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