INDEBTEDNESS - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended
	Jan. 31, 2021	Jan. 20, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Repayment of debt			$ 2,944,000	$ 2,313,000
Cash outflow from financing activities			5,160,000	2,862,000
Proceeds from issuance of debt			355,200,000	0
Debt issuance costs			20,328,000		$ 23,823,000
Loss on extinguishment of debt			12,403,000	0
Deferred financing costs			2,880,000	0
Senior Notes
Debt Instrument [Line Items]
Loss on extinguishment of debt			12,400,000
Credit Agreements, Entered Into 2019
Debt Instrument [Line Items]
Prepayment penalty			2,400,000
Credit Agreements, Entered Into 2019 | Senior Notes
Debt Instrument [Line Items]
Cash outflow from financing activities			352,000,000.0
Proceeds from issuance of debt			356,200,000
Legal fees			7,200,000
Debt issuance costs			3,700,000
Accumulated amortization expensed			900,000
Loss on extinguishment of debt			(9,800,000)	$ 2,600,000
Deferred financing costs			1,000,000.0
Payments of financing costs			2,900,000
Payments of debt issuance costs in operating activities			$ 900,000
First Lien Term Loan | Credit Agreements, Entered Into 2019 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 250,000,000.0
Debt instrument, basis spread	3.75%		4.25%
Repayment of debt			$ 161,200,000
Debt principal payment			2,900,000
Loss on extinguishment of debt			$ 2,600,000
Effective rate on term loans at end of period			3.86%		4.40%
Weighted average interest rate paid on term loans during period			3.97%	6.18%
Second Lien Term Loan | Credit Agreements, Entered Into 2019 | Senior Notes
Debt Instrument [Line Items]
Repayment of debt			$ 122,900,000
Effective rate on term loans at end of period					8.98%
Weighted average interest rate paid on term loans during period		8.98%		10.54%
Second Lien Term Loan | Credit Agreements, Entered Into 2019 | Notes Payable
Debt Instrument [Line Items]
Repayment of debt	$ 245,800,000