NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Stated and Weighted Average Effective Interest Rates (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Apr. 21, 2022
Debt Instrument [Line Items]
Remaining continuing to mature	$ 35,000,000	$ 34,000,000
Term Loan | Term Loan B-2
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.50%
Weighted average effective interest rate (as a percent)	8.17%	7.98%
Term Loan | Term Loan B-3
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	3.00%
Weighted average effective interest rate (as a percent)	8.64%	8.35%
Term Loan | Term Loan B-4
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	3.75%
Weighted average effective interest rate (as a percent)	9.83%	9.77%
Line of credit
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.00%
Weighted average effective interest rate (as a percent)	0.00%	0.00%
Notes | 5.125% Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate (as a percent)	5.13%	5.125%
Weighted average effective interest rate (as a percent)	5.33%	5.33%
Notes | 5.500% Unsecured Notes, due March 1, 2030
Debt Instrument [Line Items]
Interest rate (as a percent)	5.50%	5.50%
Weighted average effective interest rate (as a percent)	5.66%	5.66%
Notes | 4.125% Senior Secured Notes, due December 1, 2030
Debt Instrument [Line Items]
Interest rate (as a percent)	4.13%	4.125%
Weighted average effective interest rate (as a percent)	4.31%	4.31%
STG Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate borrowings outstanding			$ 612,500,000
Remaining continuing to mature			$ 37,500,000
STG Revolving Credit Facility | Line of credit
Debt Instrument [Line Items]
Aggregate borrowings outstanding	$ 0	$ 0
Letters of credit outstanding	1,000,000	1,000,000
Amount available under facility	$ 649,000,000	$ 649,000,000
STG Revolving Credit Facility | Line of credit | Minimum
Debt Instrument [Line Items]
Undrawn commitments fees (as a percent)	0.25%
Unrestricted cash first lien indebtedness ratio	2.75
STG Revolving Credit Facility | Line of credit | Weighted Average
Debt Instrument [Line Items]
Undrawn commitments fees (as a percent)	0.375%
STG Revolving Credit Facility | Line of credit | Maximum
Debt Instrument [Line Items]
Undrawn commitments fees (as a percent)	0.50%
Unrestricted cash first lien indebtedness ratio	3.0