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STOCK BASED AND OTHER COMPENSATION PLANS - Additional Information (Details) |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
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Feb. 18, 2019 | Feb. 18, 2019 $ / shares | Feb. 18, 2019 shares | Feb. 18, 2019 USD ($) | Feb. 18, 2019 | Feb. 18, 2019 installment | Jan. 24, 2019 USD ($) shares | Jul. 19, 2018 USD ($) installment shares | Apr. 24, 2018 USD ($) installment anniversary shares | Feb. 18, 2018 USD ($) shares | Dec. 21, 2017 USD ($) installment shares | Jun. 22, 2017 USD ($) installment anniversary shares | Jun. 19, 2017 USD ($) shares | Mar. 03, 2017 USD ($) installment anniversary shares | Feb. 18, 2017 USD ($) installment anniversary shares | Jan. 24, 2017 USD ($) shares | Mar. 17, 2015 | Mar. 31, 2019 USD ($) shares | Mar. 31, 2018 USD ($) shares | Sep. 30, 2018 | Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of awards granted | $ |  |  |  | $ 11,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of recognition for unrecognized compensation costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 months | 35 months |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,400,000 | $ 12,400,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Weighted Average Period for Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 months |  | 25 months 9 days |
Bonus expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,292,000 | $ 2,400,000 |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,552,114 | 25,370 |  |
Bonus expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,292,000 | $ 2,400,000 |  |
2014 Omnibus Incentive Plan | Management Grantees | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of recognition for unrecognized compensation costs | 3 years |  |  |  |  |  |  |  |  |  | 3 years |  |  |  | 3 years |  |  |  |  |  |
2014 Omnibus Incentive Plan | Management Grantees | Restricted Stock | Performance-based vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum performance target percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |
Performance period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
2014 Omnibus Incentive Plan | Management Grantees | Restricted Stock | Time Based Vesting on Three Year Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments in which awards are vested |  |  |  |  | 3 | 3 |  |  |  |  | 3 |  |  |  | 3 |  |  |  |  |  |
Number of anniversaries in which awards are vested | anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
2014 Omnibus Incentive Plan | Michael Mazzei | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of recognition for unrecognized compensation costs |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
2014 Omnibus Incentive Plan | Harris | Restricted Stock | Time-based vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
2014 Omnibus Incentive Plan | Non-Management Grantee | Restricted Stock | Time Based Vesting on Three Year Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments in which awards are vested | installment |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |
2014 Deferred Compensation Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Days following the end of the participant’s employment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |
Stock price, days following the end of the participant’s employment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45 days |  |  |  |
Units outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 249,788 |  |  | 380,662
Units unvested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 133,037 |  |  | 130,389
Total employee's contribution, net of forfeitures and payouts related to terminations | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,300,000 |  |  |
Phantom Units 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total employee's contribution, net of forfeitures and payouts related to terminations | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,900,000
Class A Common Stock | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  |  |  |  |  |  | 4,720 | 3,566 | 25,370 |  |  |  |  |  |  |  | 1,541,683 | 25,370 |  |
Number of installments in which awards are vested | installment |  |  |  |  |  | 3 |  | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |
Number of anniversaries in which awards are vested | anniversary |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Period of recognition for unrecognized compensation costs |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value | $ |  |  |  |  |  |  |  | $ 100,000 | $ 100,000 | $ 400,000 |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Management Grantees | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  |  |  |  |  | 682 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value | $ |  |  |  |  |  |  | $ 11,328 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Board of Directors | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  | 25,626 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value | $ |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Non-Management Grantee | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  | 849,087 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments in which awards are vested |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of restricted stock awards | $ / shares |  | $ 14,909,967 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of awards granted | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,130 |  |  |  |  |  |  |
Number of installments in which awards are vested | installment |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Number of anniversaries in which awards are vested | anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Restricted Stock | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected To Vest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,775 |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Restricted Stock | Period 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected To Vest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,775 |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Restricted Stock | Period 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected To Vest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,775 |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Restricted Stock | Period 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected To Vest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,775 |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Restricted Stock | Period 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected To Vest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,775 |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Restricted Stock | Period 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected To Vest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,775 |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Management Grantees | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of awards granted | $ |  |  |  |  |  |  |  |  |  |  | $ 10,500,000 |  |  |  | $ 10,200,000 | $ 30,455 |  |  |  |  |
Number of restricted shares granted (in shares) |  |  | 666,288 |  |  |  |  |  |  |  | 768,205 |  |  |  | 736,461 | 2,191 |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Management Grantees | Restricted Stock | Time-based vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  | 50.00% |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Management Grantees | Restricted Stock | Performance-based vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 50.00% |  |  |  |  |  | 50.00% |  |  |  | 50.00% |  |  |  |  |  |
Number of installments in which awards are vested | installment |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  | 3 |  |  |  |  |  |
Number of anniversaries in which awards are vested | anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Management Grantees | Restricted Stock With Dividend Equivalent Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of awards granted | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,475 |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500 |  |  |  |  |  |
Cash dividends received | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Board of Directors | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of awards granted | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 224,993 |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,245 |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | New Employee | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of awards granted | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,002 |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,881 |  |  |  |  |  |
Number of installments in which awards are vested | installment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of anniversaries in which awards are vested | installment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Michael Mazzei | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of awards granted | $ |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 5,346 |  |  |  |  |  |  |  |  |
Number of installments in which awards are vested | installment |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Number of anniversaries in which awards are vested | anniversary |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Non-Management Grantee | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of awards granted | $ |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  | $ 300,000 |  | $ 600,000 |  |  |  |  |  |
Number of restricted shares granted (in shares) |  |  |  |  |  |  |  |  |  |  | 369,328 |  | 21,307 |  | 40,000 |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Non-Management Grantee | Restricted Stock | Time-based vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Non-Management Grantee | Restricted Stock | Performance-based vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Number of installments in which awards are vested | installment |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Non-Management Grantee | Restricted Stock | Period 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected To Vest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,775 |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Omnibus Incentive Plan | Non-Management Grantee | Restricted Stock | Period 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected To Vest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,780 |  |  |  |  |  |  |  |
Class A Common Stock | 2014 Deferred Compensation Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |

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