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STOCK BASED AND OTHER COMPENSATION PLANS - Summary of Grants (Details) - $ / shares
3 Months Ended 9 Months Ended
Jul. 19, 2018
Apr. 23, 2018
Feb. 18, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of Shares/Options (in shares)           1,580,807 33,656
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Options (in shares)       0 0 12,073 0
Class A Common Stock | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of Shares/Options (in shares) 4,720 3,566 25,370 23,443 4,720 1,569,694 33,656
Weighted Average Fair Value Per Share (in dollars per share)       $ 16.58 $ 15.89 $ 17.54 $ 14.86
Class A Common Stock | Dividend Declared              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of Shares/Options (in shares)       0 0 11,113 0
Weighted Average Fair Value Per Share (in dollars per share)       $ 0 $ 0 $ 16.61 $ 0