EQUITY AND EARNINGS PER SHARE - Summary of Outstanding Options - Period End (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	14,428,655
Options exercisable (in shares)	8,568,129
Issued to the independent directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	7,000
Stock Options | Issued to the independent directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of grant	Various
Number of unexercised options (in shares)	7,000
Options exercisable (in shares)	7,000
Weighted average exercise price (in dollars per share) | $ / shares	$ 13.57
Intrinsic Value of Exercisable Options as of June 30, 2020 (millions) | $	$ 0.0
Stock Options | Manager | 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of grant	2017
Number of unexercised options (in shares)	1,130,916
Options exercisable (in shares)	1,130,916
Weighted average exercise price (in dollars per share) | $ / shares	$ 13.95
Intrinsic Value of Exercisable Options as of June 30, 2020 (millions) | $	$ 0.0
Stock Options | Manager | 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of grant	2018
Number of unexercised options (in shares)	5,320,000
Options exercisable (in shares)	4,156,548
Weighted average exercise price (in dollars per share) | $ / shares	$ 16.66
Intrinsic Value of Exercisable Options as of June 30, 2020 (millions) | $	$ 0.0
Stock Options | Manager | 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of grant	2019
Number of unexercised options (in shares)	6,351,000
Options exercisable (in shares)	3,057,700
Weighted average exercise price (in dollars per share) | $ / shares	$ 16.15
Intrinsic Value of Exercisable Options as of June 30, 2020 (millions) | $	$ 0.0
Stock Options | Manager | 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of grant	2020
Number of unexercised options (in shares)	1,619,739
Options exercisable (in shares)	215,965
Weighted average exercise price (in dollars per share) | $ / shares	$ 17.41
Intrinsic Value of Exercisable Options as of June 30, 2020 (millions) | $	$ 0.0
Options Granted In 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	1,130,916
Weighted average exercise price (in dollars per share) | $ / shares	$ 13.95
Options Granted in 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	1,159,833
Options Granted In 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	1,270,200
Options Assigned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	3,560,949
Minimum | Options Granted in 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in dollars per share) | $ / shares	$ 16.54
Minimum | Options Granted In 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in dollars per share) | $ / shares	15.13
Maximum | Options Granted in 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in dollars per share) | $ / shares	18.01
Maximum | Options Granted In 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in dollars per share) | $ / shares	$ 16.67