BENEFIT PLANS (Narrative) (Details) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) employee ShareBasedCompensationPlan	Nov. 30, 2020	Dec. 31, 2021	Dec. 31, 2020 USD ($) employee ShareBasedCompensationPlan item	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of defined contribution plans | ShareBasedCompensationPlan	2			2
Expected return on plan assets	5.25%	5.75%			5.75%
Contributions to multiemployer pension plans				$ 10,277	$ 10,385	$ 10,081
Percentage of contributions to individual multiemployer pension funds				5.00%	5.00%	5.00%
Percentage of domestic hourly labor force covered by collective bargaining agreements expiring in 2021				14.00%
Number of unfunded supplemental retirement plans | item				1	1
Accrued costs for supplemental retirement plan	$ 2,525			$ 2,525	$ 1,069
Expense recognized related to defined contribution plans				$ 50,772	53,853	$ 40,718
Percentage of domestic hourly labor force covered by collective bargaining agreements				8.20%
Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of employees | employee	339			339
Number of employess that participate in multiemployer pension plans | employee				0
Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets			5.25%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of funded, noncontributory defined benefit pension plans | ShareBasedCompensationPlan				2
Projected benefit obligation	$ 1,059,545			$ 1,059,545	$ 1,090,893	$ 958,936
Expected return on plan assets	5.25%	5.75%			5.75%	7.00%
Employer contributions				8,819	$ 8,882	$ 109,631
Estimated employer contribution in 2021	$ 8,060			$ 8,060
Discount rate	2.57%			2.57%	3.28%	4.39%
Estimated weighted-average discount rate to measure service cost				2.92%	4.59%
Estimated weighted-average discount rate to measure interest cost				2.78%	4.02%
Pension Plans, Defined Benefit [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discretionary qualified plan contribution						$ 100,000
Employer contributions				$ 0	$ 0
Pension Plans, Defined Benefit [Member] | Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded, nonqualified pension plans | ShareBasedCompensationPlan				3
Projected benefit obligation	$ 67,241			$ 67,241	70,298
Employer contributions				8,819	$ 8,882	9,631
Estimated employer contribution in 2021	$ 8,060			$ 8,060
Pension Plans, Defined Benefit [Member] | Return Seeking [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges for plan assets	50.00%			50.00%	50.00%
Pension Plans, Defined Benefit [Member] | Liability Hedge [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges for plan assets	50.00%			50.00%	50.00%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Normal retirement age				65 years
Projected benefit obligation	$ 33,883			$ 33,883	$ 41,187	$ 40,834
Estimated employer contribution in 2021	$ 4,471			$ 4,471
Discount rate	2.09%			2.09%	2.84%	4.01%
Estimated weighted-average discount rate to measure service cost				3.09%	4.23%
Estimated weighted-average discount rate to measure interest cost				2.42%	3.63%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.55%			1.55%	2.67%
Minimum [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of the plans’ assets are in private equity and debt securities via private partnerships				1.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.72%			2.72%	3.37%