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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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LONG-TERM DEBT - Schedule of Long-term Debt (Details) - USD ($)						1 Months Ended	4 Months Ended	8 Months Ended	11 Months Ended	12 Months Ended
	Jul. 16, 2020	Mar. 26, 2020	Mar. 13, 2020	Feb. 03, 2020	Feb. 02, 2020	Jul. 31, 2020	May 01, 2019	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2018	Nov. 22, 2019	Aug. 07, 2019
Debt Instrument [Line Items]
Total debt								$ 5,765,416,000	$ 6,016,930,000	$ 6,016,930,000
Original issue discount								0	(18,817,000)	(18,817,000)
Long-term debt fees								(19,428,000)	(21,797,000)	(21,797,000)
Less: Current portion								8,912,000	34,775,000	34,775,000
Total long-term debt								5,756,504,000	5,982,155,000	5,982,155,000
Payments on credit facilities							$ 8,294,000	1,285,408,000		532,392,000	$ 622,677,000
Incremental Term Loan Facility Due 2026 \| Subsidiaries
Debt Instrument [Line Items]
Debt instrument, face amount	$ 450,000,000.0
Proceeds from issuance of term loan	425,800,000
Borrowing base availability	190,600,000
Asset-based Revolving Credit Facility due 2023
Debt Instrument [Line Items]
Repayments of lines of credit						$ 235,000,000.0
Asset-based Revolving Credit Facility due 2023 \| Subsidiaries
Debt Instrument [Line Items]
Repayments of lines of credit	235,000,000.0
Secured debt
Debt Instrument [Line Items]
Total debt								4,322,263,000	4,600,762,000	4,600,762,000
Secured debt \| Subsidiaries
Debt Instrument [Line Items]
Proceeds from issuance of term loan						$ 450,000,000.0
Secured debt \| Term Loan Facility due 2026
Debt Instrument [Line Items]
Total debt							3,500,000,000	2,251,271,000	2,080,259,000	2,080,259,000
Stated interest rate (as a percent)													5.25%
Payments on credit facilities				$ 150,000,000.0
Debt instrument, face amount							3,500,000,000
Secured debt \| Term Loan Facility due 2026 \| Subsidiaries
Debt Instrument [Line Items]
Payments on credit facilities				$ 150,000,000.0						23,300,000
Debt instrument, face amount	$ 450,000,000.0						3,500,000,000
Secured debt \| Incremental Term Loan Facility Due 2026
Debt Instrument [Line Items]
Total debt								0	447,750,000	447,750,000
Secured debt \| Asset-based Revolving Credit Facility due 2023
Debt Instrument [Line Items]
Total debt							0	0	0	0
Secured debt \| 6.375% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Total debt							$ 800,000,000	800,000,000	$ 800,000,000	$ 800,000,000
Stated interest rate (as a percent)							6.375%		6.375%	6.375%		6.375%	6.375%
Debt instrument, face amount							$ 800,000,000		$ 800,000,000.0	$ 800,000,000.0
Secured debt \| 5.25% Senior Secured Notes due 2027
Debt Instrument [Line Items]
Total debt								750,000,000	$ 750,000,000	$ 750,000,000		$ 500,000,000.0
Stated interest rate (as a percent)							5.25%		5.25%	5.25%		5.25%	5.25%
Debt instrument, face amount													$ 750,000,000.0
Secured debt \| 4.75% Senior Secured Notes due 2028
Debt Instrument [Line Items]
Total debt								500,000,000	$ 500,000,000	$ 500,000,000
Stated interest rate (as a percent)									4.75%	4.75%
Secured debt \| Other secured subsidiary debt
Debt Instrument [Line Items]
Total debt								20,992,000	$ 22,753,000	$ 22,753,000
Unsecured Debt \| 8.375% Senior Unsecured Notes due 2027
Debt Instrument [Line Items]
Total debt							$ 1,450,000,000	1,450,000,000	$ 1,450,000,000	$ 1,450,000,000
Stated interest rate (as a percent)							8.375%		8.375%	8.375%
Debt instrument, face amount							$ 1,450,000,000
Unsecured Debt \| Other unsecured subsidiary debt
Debt Instrument [Line Items]
Total debt								$ 12,581,000	$ 6,782,000	$ 6,782,000
Line of Credit \| Asset-based Revolving Credit Facility due 2023
Debt Instrument [Line Items]
Debt instrument, face amount									450,000,000.0	450,000,000.0
Borrowing base availability									417,100,000	417,100,000
Maximum borrowing capacity									450,000,000.0	450,000,000.0
Letters of credit outstanding									32,900,000	32,900,000
Line of credit, amount available to be drawn									$ 172,000,000	$ 172,000,000
Line of Credit \| Asset-based Revolving Credit Facility due 2023 \| Subsidiaries
Debt Instrument [Line Items]
Draws on credit facilities		$ 350,000,000.0	$ 350,000,000.0
LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				3.00%
LIBOR \| Secured debt \| Term Loan Facility due 2026
Debt Instrument [Line Items]
Basis spread on variable rate									3.00%
LIBOR \| Secured debt \| Term Loan Facility due 2026 \| Subsidiaries
Debt Instrument [Line Items]
Basis spread on variable rate				3.00%	4.00%
Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate				2.00%
Base Rate \| Secured debt \| Term Loan Facility due 2026
Debt Instrument [Line Items]
Basis spread on variable rate									2.00%
Base Rate \| Secured debt \| Term Loan Facility due 2026 \| Subsidiaries
Debt Instrument [Line Items]
Basis spread on variable rate				2.00%	3.00%				3.00%