DEBT - Credit Facility (Details)			3 Months Ended	12 Months Ended
	Sep. 15, 2021 USD ($)	Dec. 10, 2019 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
Letters of credit outstanding				$ 200,000	$ 200,000
Ratio of debt to EBITDA Increase	0.50
Write-off of previously-capitalized debt issuance costs				1,066,000	0	$ 333,000
Amortization of debt issuance costs				5,992,000	3,474,000	1,974,000
Amortization of debt discount				30,695,000	19,570,000	12,016,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Percent of domestic subsidiaries equity	100.00%
Percent of voting equity	65.00%
Percent of non-voting equity	100.00%
Revolving credit facility, letter of credit fronting fee percentage	0.125%
Letter of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 20,000,000
Fed Funds Effective Rate Overnight Index Swap Rate | Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	0.50%
LIBOR | Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	1.00%
Minimum | Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility, unused capacity, commitment fee percentage	0.25%
Revolving credit facility, letter of credit participation fee percentage	2.25%
Maximum
Line of Credit Facility [Line Items]
Ratio of debt to EBITDA	2.50
Maximum | Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility, unused capacity, commitment fee percentage	0.50%
Revolving credit facility, letter of credit participation fee percentage	2.75%
Credit Agreement | Line of Credit
Line of Credit Facility [Line Items]
Line of credit outstanding				0
Potential additional borrowing capacity	$ 116,000,000
Credit agreement, ratio of debt to EBITDA	3.00
Premium percentage	0.010
Premium percentage period	6 months
Credit Agreement | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 200,000,000
Capacity available for general corporate purchases	80,000,000
Covenant threshold	20,000,000
Revolving credit facility, debt issuance costs	2,800,000
Interest expense				3,400,000
Unused borrowing capacity fee				2,000,000
Amortization of debt issuance costs				1,400,000
Credit Agreement | Delayed Draw Term Loan | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	250,000,000
Revolving credit facility, debt issuance costs	3,500,000
Unamortized debt discount	$ 2,500,000
Interest expense				5,900,000
Unused borrowing capacity fee				3,500,000
Amortization of debt issuance costs				1,400,000
Amortization of debt discount				$ 1,000,000
Credit Agreement | Minimum | LIBOR | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	2.25%
Credit Agreement | Minimum | LIBOR | Delayed Draw Term Loan | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	3.75%
Credit Agreement | Minimum | ABR | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	1.25%
Credit Agreement | Minimum | ABR | Delayed Draw Term Loan | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	2.75%
Credit Agreement | Maximum | LIBOR | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	2.75%
Credit Agreement | Maximum | LIBOR | Delayed Draw Term Loan | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	4.00%
Credit Agreement | Maximum | ABR | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	1.75%
Credit Agreement | Maximum | ABR | Delayed Draw Term Loan | Line of Credit
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	3.00%
Amended Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Interest expense						6,100,000
Amended Revolving Credit Facility | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 500,000,000
Revolving credit facility, term		5 years
Line of credit outstanding					0
Write-off of previously-capitalized debt issuance costs			$ 1,100,000
Interest expense					4,300,000
Unused borrowing capacity fee					1,700,000	600,000
Amortization of debt issuance costs					1,300,000	600,000
Amended Revolving Credit Facility | LIBOR | Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Interest expense					$ 1,300,000	$ 4,900,000