EQUITY AND EARNINGS PER SHARE - Summary of Outstanding Options - Period End (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	18,502,188.000
Options Exercisable (in shares)	12,562,658.000
Options Granted in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	258,750
Weighted average exercise price (in dollars per share) | $ / shares	$ 12.20
Options Granted in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	1,708,708
Options Granted in 2015 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in dollars per share) | $ / shares	$ 15.25
Options Granted in 2015 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise price (in dollars per share) | $ / shares	$ 15.88
Options Granted in 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	400,000
Weighted average exercise price (in dollars per share) | $ / shares	$ 14.20
Options Assigned
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	2,367,458
Issued to the independent directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unexercised options (in shares)	6,000
Issued to the independent directors | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	Directors
Date of Grant	Various
Number of unexercised options (in shares)	6,000
Options Exercisable (in shares)	6,000
Weighted average exercise price (in dollars per share) | $ / shares	$ 13.99
Intrinsic value of exercisable options | $	$ 0.0
2012 | Manager | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	Manager
Date of Grant	2012
Number of unexercised options (in shares)	25,000
Options Exercisable (in shares)	25,000
Weighted average exercise price (in dollars per share) | $ / shares	$ 7.19
Intrinsic value of exercisable options | $	$ 0.2
2013 | Manager | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	Manager
Date of Grant	2013
Number of unexercised options (in shares)	835,571
Options Exercisable (in shares)	835,571
Weighted average exercise price (in dollars per share) | $ / shares	$ 11.48
Intrinsic value of exercisable options | $	$ 4.4
2014 | Manager | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	Manager
Date of Grant	2014
Number of unexercised options (in shares)	1,437,500
Options Exercisable (in shares)	1,437,500
Weighted average exercise price (in dollars per share) | $ / shares	$ 12.20
Intrinsic value of exercisable options | $	$ 6.5
2015 | Manager | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	Manager
Date of Grant	2015
Number of unexercised options (in shares)	8,543,539
Options Exercisable (in shares)	8,072,518
Weighted average exercise price (in dollars per share) | $ / shares	$ 15.46
Intrinsic value of exercisable options | $	$ 10.3
2016 | Manager | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	Manager
Date of Grant	2016
Number of unexercised options (in shares)	2,000,000
Options Exercisable (in shares)	866,667
Weighted average exercise price (in dollars per share) | $ / shares	$ 14.20
Intrinsic value of exercisable options | $	$ 2.2
2017 | Manager | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	Manager
Date of Grant	2017
Number of unexercised options (in shares)	5,654,578
Options Exercisable (in shares)	1,319,402
Weighted average exercise price (in dollars per share) | $ / shares	$ 15.00
Intrinsic value of exercisable options | $	$ 2.3