CREDIT FACILITY - Narrative (Details) $ in Thousands					3 Months Ended			7 Months Ended	8 Months Ended	12 Months Ended
	Jun. 18, 2021 USD ($)	Feb. 12, 2021 USD ($)	Apr. 08, 2020 USD ($)	Sep. 04, 2019 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2019 USD ($)	Sep. 03, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 23, 2020 USD ($)
Line of Credit Facility [Line Items]
Payment of debt issuance cost				$ 6,100				$ 6,105	$ 0	$ 2,133	$ 1,148
Amortization of debt issuance costs								309	399	1,082	1,056
Debt issuance costs, gross				6,100
Consolidated EBITDA, maximum amount										$ 46,900
Consolidated EBITDA, percentage										1.000
Debt instrument, leverage ratio										7.4
Annual excess cash flow, percentage										0.50
Net cash proceeds of certain asset sales or casualty events, percentage										1
Net cash proceeds of debt, percentage										1
Prepayment premium on early repayment of term loan								0	0	$ 1,563	0
Loss on extinguishment of debt	$ 5,000							0	0	5,015	0
Long-term debt, gross										$ 192,631	246,999
Long-term debt, irrevocable letter of credit threshold												$ 500
Long-term debt, irrevocable letter of credit, extension period										1 year
Unamortized Deferred Financing Costs
Line of Credit Facility [Line Items]
Loss on extinguishment of debt	3,400
Prepayment Premiums
Line of Credit Facility [Line Items]
Loss on extinguishment of debt	1,600
IPO
Line of Credit Facility [Line Items]
Prepayment premium on early repayment of term loan	$ 131,500
Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate										0.375%
Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate										0.50%
London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate										1.00%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Amortization of debt issuance costs								100	100	$ 200	200
Unamortized debt issuance expense										$ (500)	$ (700)
Long-term debt, weighted average interest rate, over time										2.75%	2.75%
Long-term debt, gross										$ 39,400	$ 39,500
Undrawn Letter Of Credit
Line of Credit Facility [Line Items]
Debt instrument, face amount										$ 10,000
Secured Debt
Line of Credit Facility [Line Items]
Amortization of debt issuance costs				$ 5,200
Debt issuance costs, amortization period				84 months
Long-term debt, weighted average interest rate, over time										6.10%	6.50%
Long-term debt, gross										$ 192,600	$ 222,200
Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 40,000
Debt instrument, term				5 years
Amortization of debt issuance costs				$ 900
Debt issuance costs, amortization period				60 months
Line of Credit | Bridge Loan
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 10,000
2020 Incremental Term Loan
Line of Credit Facility [Line Items]
Long-term debt, gross											24,800
Term Loans
Line of Credit Facility [Line Items]
Amortization of debt issuance costs								$ 200	$ 300	900	900
Debt instrument, aggregate principal amount, payment, percentage							0.0025
Unamortized debt issuance expense										$ (3,000)	$ (5,200)
Term Loans | Secured Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount				$ 225,000
Debt instrument, term				7 years
2020 Incremental Term Loan
Line of Credit Facility [Line Items]
Long-term debt, weighted average interest rate, over time										10.00%
2020 Incremental Term Loan | Secured Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount			$ 25,000
Debt issuance costs, amortization period			77 months
Debt issuance costs, gross			$ 1,100
Debt instrument, aggregate principal amount, payment, percentage					0.0025	0.0025
2021 Incremental Term Loan
Line of Credit Facility [Line Items]
Long-term debt, weighted average interest rate, over time										7.00%
2021 Incremental Term Loan | Secured Debt
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 78,000
Debt issuance costs, amortization period		67 months
Debt issuance costs, gross		$ 2,400
Debt instrument, quarterly payment amount					$ 800
Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate										5.25%
Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate										4.75%
Credit Agreement | Base Rate | Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate										4.25%
Credit Agreement | Base Rate | Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate										3.75%
Credit Agreement | Eurodollar | Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate										1.00%
Credit Agreement | Eurodollar | Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate										0.75%