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EQUITY-BASED COMPENSATION - Share-repurchases (Details) - USD ($) | 12 Months Ended
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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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