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EQUITY-BASED COMPENSATION - Share-repurchases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in paid-in capital	$ 10,876,000	$ 18,600,000	$ 16,562,000
2016 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares repurchased in open market	1,989,440	2,180,806
Number of shares repurchased with employee minimum tax withholding requirements	210,384	108,074
Decrease in paid-in capital	$ 12,300,000
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares repurchased in open market	2,199,824	2,288,880	1,766,428
Decrease in paid-in capital	$ 22,000	$ 23,000	$ 17,000
Class A Common Stock | 2016 plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in Class A common stock	$ 22,000

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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