POSTRETIREMENT BENEFITS (plan assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Postretirement benefits [Line Items]
Postretirement benefit plan, plan assets [Extensible List]	Postretirement benefit plan [Member]	Postretirement benefit plan [Member]
Allocation of plan assets	100.00%	100.00%
Fair value of plan assets	$ 144,800	$ 139,372
Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	224	28,305
Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	144,576	87,086
Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
Investments measured at net asset value [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 23,981
Mortgage-backed securities [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	41.00%	24.00%
Fair value of plan assets	$ 58,799	$ 33,053
Mortgage-backed securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	(94)	0
Mortgage-backed securities [Member] | Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	58,893	10,546
Mortgage-backed securities [Member] | Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
Mortgage-backed securities [Member] | Investments measured at net asset value [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 22,507
International equity securities [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	20.00%	20.00%
Target allocation of plan assets	20.00%
Fair value of plan assets	$ 28,993	$ 28,144
International equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	285	24,512
International equity securities [Member] | Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	28,708	3,632
International equity securities [Member] | Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
International equity securities [Member] | Investments measured at net asset value [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
U.S. corporate debt securities [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	19.00%	21.00%
Fair value of plan assets	$ 27,858	$ 28,913
U.S. corporate debt securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	22	0
U.S. corporate debt securities [Member] | Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	27,836	27,439
U.S. corporate debt securities [Member] | Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
U.S. corporate debt securities [Member] | Investments measured at net asset value [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 1,474
U,S, large capitalization equity securities [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	17.00%	17.00%
Target allocation of plan assets	17.00%
Fair value of plan assets	$ 25,395	$ 24,536
U,S, large capitalization equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	(15)	0
U,S, large capitalization equity securities [Member] | Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	25,410	24,536
U,S, large capitalization equity securities [Member] | Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
U,S, large capitalization equity securities [Member] | Investments measured at net asset value [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	$ 0
Government debt securities [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	0.00%	15.00%
Fair value of plan assets		$ 20,357
Government debt securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets		0
Government debt securities [Member] | Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets		20,357
Government debt securities [Member] | Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets		0
Government debt securities [Member] | Investments measured at net asset value [Member]
Postretirement benefits [Line Items]
Fair value of plan assets		$ 0
U.S. small and mid-capitalization equity securities [Member]
Postretirement benefits [Line Items]
Allocation of plan assets	3.00%	3.00%
Target allocation of plan assets	3.00%
Fair value of plan assets	$ 3,755	$ 3,762
U.S. small and mid-capitalization equity securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	26	3,406
U.S. small and mid-capitalization equity securities [Member] | Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	3,729	356
U.S. small and mid-capitalization equity securities [Member] | Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	0	0
U.S. small and mid-capitalization equity securities [Member] | Investments measured at net asset value [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 0	0
Other debt securities [Member]
Postretirement benefits [Line Items]
Fair value of plan assets		607
Other debt securities [Member] | Quoted prices in active markets for identical assets (Level 1) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets		387
Other debt securities [Member] | Significant other observable inputs (Level 2) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets		220
Other debt securities [Member] | Significant unobservable inputs (Level 3) [Member]
Postretirement benefits [Line Items]
Fair value of plan assets		0
Other debt securities [Member] | Investments measured at net asset value [Member]
Postretirement benefits [Line Items]
Fair value of plan assets		0
Fixed income securities [Member]
Postretirement benefits [Line Items]
Target allocation of plan assets	60.00%
Postretirement benefit plan [Member]
Postretirement benefits [Line Items]
Fair value of plan assets	$ 144,800	$ 139,372	$ 129,918