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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Deferred income taxes (c)		$ 7,812	$ 2,910	$ (1,425)
Total recognized in other comprehensive income (loss)		(26,154)	(9,696)	4,771
Other comprehensive income (loss), risk-management assets/liabilities of unconsolidated affiliates, net of tax		(7,369)	(7,205)
Accumulated other comprehensive loss, net of tax		$ (157,635)	$ (131,481)	$ (121,785)
Expected long-term return on plan assets		7.50%	7.50%	8.00%
Compensation increase rate		3.70%	3.65%	3.00%
Reclassification Adjustment from AOCI, Tax, Retirement and Other Postretirement Benefit Plans, Gain (Loss)		$ 4,200	$ 2,900	$ 3,800
Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligation		583,072	534,849	466,994
Service cost		8,154	7,825	7,339
Interest cost		18,318	20,528	17,659
Plan participants’ contributions		0	0
Actuarial loss		37,951	55,954
Benefits paid		(16,200)	(16,452)
Fair value of plan assets		379,092	346,792	290,684
Actual return on plan assets (a)		36,400	58,060
Employer contributions		12,100	14,500
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		0	0
Defined Benefit Plan, Plan Assets, Benefits Paid		(16,200)	(16,452)
Balance at December 31		(203,980)	(188,057)
Current liabilities		(4,679)	(4,616)
Noncurrent liabilities		(199,301)	(183,441)
Balance at December 31		(203,980)	(188,057)
Defined Benefit Plan, Accumulated Benefit Obligation		548,200	498,800
Expected return on plan assets		(24,964)	(23,600)	(23,917)
Amortization of prior service cost (credit)		114	0	0
Amortization of net loss		18,306	12,649	17,060
Net periodic benefit cost (income)		19,928	17,402	18,141
Net gain (loss) (a)		(31,016)	(25,389)	(16,351)
Prior service cost		0	(601)	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax		114	0	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax		18,306	12,649	17,060
Deferred income taxes (c)		2,897	3,068	(18,928)
Total recognized in other comprehensive income (loss)		(9,699)	(10,273)	$ (18,219)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax		(487)	(601)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax		(185,662)	(172,952)
Accumulated other comprehensive loss		(186,149)	(173,553)
Deferred income taxes		49,251	46,354
Accumulated other comprehensive loss, net of tax		$ (136,898)	$ (127,199)
Discount rate		3.00%	3.50%
Compensation increase rate		3.60%	3.70%
Discount Rates - Retirement and Other Postretirement Plans		3.50%	4.50%	3.75%
Domestic and international equities		42.00%
Long duration fixed income		30.00%
Return-seeking credit		11.00%
Hedge funds		10.00%
Real estate funds		7.00%
Total		100.00%
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months		$ 19,460
Defined Benefit Plan, Expected Future Benefit Payment, Year Two		20,325
Defined Benefit Plan, Expected Future Benefit Payment, Year Three		21,216
Defined Benefit Plan, Expected Future Benefit Payment, Year Four		22,234
Defined Benefit Plan, Expected Future Benefit Payment, Year Five		23,260
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter		127,038
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(16,200)	$ (16,452)
Retirement Plan [Member] | Subsequent Event [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 11,200
Retirement Plan [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		43	110
Retirement Plan [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,890	3,263
Retirement Plan [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,933	3,373
Retirement Plan [Member] | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		374,159	343,419
Retirement Plan [Member] | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		379,092	346,792
Retirement Plan [Member] | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		43	47
Retirement Plan [Member] | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Equity securities | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		43	47
Retirement Plan [Member] | Equity securities | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		164,099	149,985
Retirement Plan [Member] | Equity securities | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		164,142	150,032
Retirement Plan [Member] | Real Estate Funds [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Real Estate Funds [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Real Estate Funds [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Real Estate Funds [Member] | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Real Estate Funds [Member] | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		24,134	23,885
Retirement Plan [Member] | Real Estate Funds [Member] | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		24,134	23,885
Retirement Plan [Member] | Government obligations | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Government obligations | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Government obligations | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Government obligations | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Government obligations | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		45,237	50,708
Retirement Plan [Member] | Government obligations | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		45,237	50,708
Retirement Plan [Member] | Corporate obligations | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Corporate obligations | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Corporate obligations | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Corporate obligations | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Corporate obligations | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		101,626	85,898
Retirement Plan [Member] | Corporate obligations | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		101,626	85,898
Retirement Plan [Member] | Common/collective trusts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Common/collective trusts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,890	3,263
Retirement Plan [Member] | Common/collective trusts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Common/collective trusts | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,890	3,263
Retirement Plan [Member] | Common/collective trusts | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Common/collective trusts | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,890	3,263
Retirement Plan [Member] | Money market funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			63
Retirement Plan [Member] | Money market funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0
Retirement Plan [Member] | Money market funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0
Retirement Plan [Member] | Money market funds | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			63
Retirement Plan [Member] | Money market funds | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0
Retirement Plan [Member] | Money market funds | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			63
Retirement Plan [Member] | Other Investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Other Investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Other Investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Other Investments | Subtotal
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Retirement Plan [Member] | Other Investments | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		39,063	32,943
Retirement Plan [Member] | Other Investments | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		39,063	32,943
Unfunded Capital Commitments		$ 0	$ 0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumed Health Care Cost Trend Rate		6.50%	7.00%
Defined Benefit Plan Assumed Ultimate Health Care Cost Trend Rate		5.00%	5.00%
Minimum Number Of Years Of Service For Certain Employees To Be Eligible To Participate In Welfare Plans That Provide Postretirement Medical And Life Insurance Benefits		5 years
Benefit Obligation		$ 54,515	$ 52,309	$ 46,840
Service cost		460	468	845
Interest cost		1,771	2,038	2,108
Plan participants’ contributions		1,032	1,142
Actuarial loss		2,860	5,101
Benefits paid		(3,917)	(3,280)
Fair value of plan assets		20,874	39,060	30,800
Actual return on plan assets (a)		(15,699)	8,087
Employer contributions		0	2,000
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		1,032	1,142
Defined Benefit Plan, Plan Assets, Benefits Paid		(3,519)	(2,969)
Balance at December 31		(33,641)	(13,249)
Current liabilities		0	0
Noncurrent liabilities		(33,641)	(13,249)
Balance at December 31		(33,641)	(13,249)
Expected return on plan assets		(2,894)	(2,285)	(2,690)
Amortization of prior service cost (credit)		0	(227)	(1,662)
Amortization of net loss		5	297	1,338
Net periodic benefit cost (income)		(658)	291	(61)
Net gain (loss) (a)		(21,453)	700	6,545
Prior service cost		0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax		0	(227)	(1,662)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax		5	297	1,338
Deferred income taxes (c)		4,933	(177)	(2,831)
Total recognized in other comprehensive income (loss)		(16,515)	593	$ 3,390
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax		0	0
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax		(25,558)	(4,110)
Accumulated other comprehensive loss		(25,558)	(4,110)
Deferred income taxes		6,322	1,389
Accumulated other comprehensive loss, net of tax		$ (19,236)	$ (2,721)
Discount rate		2.75%	3.50%
Discount Rates - Retirement and Other Postretirement Plans		3.50%	4.50%	3.75%
Year that the rate reaches the ultimate trend rate		2024	2024
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months		$ 3,297
Defined Benefit Plan, Expected Future Benefit Payment, Year Two		3,408
Defined Benefit Plan, Expected Future Benefit Payment, Year Three		3,371
Defined Benefit Plan, Expected Future Benefit Payment, Year Four		3,335
Defined Benefit Plan, Expected Future Benefit Payment, Year Five		3,322
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter		15,848
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(3,917)	$ (3,280)
Other Postretirement Benefits Plan [Member] | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		20,066	2,043
Other Postretirement Benefits Plan [Member] | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		808	37,017
Other Postretirement Benefits Plan [Member] | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Other Postretirement Benefits Plan [Member] | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		20,874	39,060
Other Postretirement Benefits Plan [Member] | Equity securities | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		15,116	2,043
Other Postretirement Benefits Plan [Member] | Equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Other Postretirement Benefits Plan [Member] | Equity securities | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Other Postretirement Benefits Plan [Member] | Equity securities | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		15,116	2,043
Other Postretirement Benefits Plan [Member] | Money market funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Other Postretirement Benefits Plan [Member] | Money market funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		808	2,428
Other Postretirement Benefits Plan [Member] | Money market funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0
Other Postretirement Benefits Plan [Member] | Money market funds | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		808	2,428
Other Postretirement Benefits Plan [Member] | Insurance and group annuity contracts
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets (a)		13,200
NetProceedsFromExitOfAnInvestmentInAnInsuranceContract		16,200
Other Postretirement Benefits Plan [Member] | Insurance and group annuity contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0
Other Postretirement Benefits Plan [Member] | Insurance and group annuity contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			34,589
Other Postretirement Benefits Plan [Member] | Insurance and group annuity contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0
Other Postretirement Benefits Plan [Member] | Insurance and group annuity contracts | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			34,589
Other Postretirement Benefits Plan [Member] | Municipal Bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,950
Other Postretirement Benefits Plan [Member] | Municipal Bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Other Postretirement Benefits Plan [Member] | Municipal Bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Other Postretirement Benefits Plan [Member] | Municipal Bonds | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		4,950
Supplemental Executive Retirement Plan Investments Included in Other Assets[Member]
Defined Benefit Plan Disclosure [Line Items]
Balance at December 31		$ 116,200	98,900
401(k) Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Percent of employee matched of eligible compensation		100.00%
Percentage of Each Participants Eligible Compensation		1.00%
Contributions made to the Plan		$ 27,100	$ 30,400	$ 28,000
Profit-sharing contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of Each Participants Eligible Compensation		6.00%

X

- Definition

Assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan.

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Rate to which the cost-trend rate is assumed to decline (the ultimate trend rate)

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- Definition

Target allocation percentage in hedge fund investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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- Definition

Target allocation percentage in long duration fixed income securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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No definition available.

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- Definition

Target allocation percentage in global real estate investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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- Definition

Target allocation percentage in return-seeking credit securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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No definition available.

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Target allocation percentage to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation percentage in domestic and international equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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No definition available.

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- Definition

Minimum Number Of Years Of Service For Certain Employees To Be Eligible To Participate In Welfare Plans That Provide Postretirement Medical And Life Insurance Benefits

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No definition available.

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Other Comprehensive Income (Loss), Portion Attributable to Equity Method Investments, Net of Tax, Attributable to Parent

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- Definition

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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