LONG-TERM DEBT - Narrative (Details)		3 Months Ended		12 Months Ended
	Mar. 28, 2019 USD ($)	Mar. 31, 2020 USD ($) Financing_Arrangement	Mar. 31, 2019 USD ($)	Dec. 31, 2018	Dec. 31, 2022 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 30, 2017 USD ($)
Debt Instrument [Line Items]
Undivided interest								75.00%
(Gain) Loss on Debt Extinguishment		$ (16,833,000)	$ 23,143,000
Number of asset-backed financing arrangements | Financing_Arrangement		2
Collateral amount		$ 18,243,000
Derivative Liability, Current		3,861,000					$ 154,000
Net unrealized loss		2,773,000	0
Net unrealized loss, tax benefit		933,000	0
Gain reclassified to interest expense		4,000
Notional amount		$ 150,000,000
Estimated period for expected loss		12 months
Loss to be reclassified into earnings		$ 1,667,000
Line of Credit
Debt Instrument [Line Items]
Outstanding borrowings		0
Loans Payable | Term Loan A
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 100,000,000						$ 100,000,000
Amendment to basis points	0.50%
Weighted average interest rate		4.74%					5.55%
Loans Payable | Term Loan B
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 275,000,000						400,000,000
Amendment to basis points	1.50%
Repayment on line of credit			110,000,000
Repayment, percent of excess cash flow				75.00%
Repayment, decrease to percent of excess cash flow		25.00%
Weighted average interest rate		5.49%					6.30%
Senior Notes | 11.00% Senior Secured Second Lien Notes due November 2025
Debt Instrument [Line Items]
Principal								$ 300,000,000
Stated interest rate		11.00%						11.00%
Debt repurchased		$ 43,176,000	$ 7,000,000
Secured Debt | Other Asset-Backed Financing Maturing December 2020
Debt Instrument [Line Items]
Collateral amount		14,900,000
Secured Debt | Other Asset-Backed Financing Maturing September 2024
Debt Instrument [Line Items]
Collateral amount		$ 3,343,000
Secured Debt | Other Asset-Backed Financing Arrangements
Debt Instrument [Line Items]
Weighted average interest rate		5.42%					5.07%
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400,000,000							$ 300,000,000
Outstanding borrowings		$ 0					$ 0
Covenant, maximum annual dividend	$ 50,000,000
First lien gross leverage ratio, maximum		1.75
First lien gross leverage ratio, actual		1.45
Total net leverage ratio, maximum		2.75
Total net leverage ratio, actual		2.17
Fixed charge coverage ratio, minimum		1.10
Fixed charge coverage ratio		1.27
Letters of credit outstanding		$ 79,880,000					69,588,000
Remaining borrowing capacity		$ 320,120,000					$ 330,412,000
Minimum | Loans Payable | Term Loan B
Debt Instrument [Line Items]
Repayment, percent of excess cash flow		0.00%
Maximum | Loans Payable | Term Loan B
Debt Instrument [Line Items]
Repayment, percent of excess cash flow		75.00%
Scenario, Forecast | Loans Payable | Term Loan B
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount					$ 50,000,000	$ 150,000,000