Quarterly report pursuant to Section 13 or 15(d)

EQUITY AND EARNINGS PER SHARE - Summary of Outstanding Options - Period End (Details)

v3.7.0.1
EQUITY AND EARNINGS PER SHARE - Summary of Outstanding Options - Period End (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 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) 10,942,847.000
Options Granted in 2014 [Member]  
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 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of unexercised options (in shares) 1,708,708
Options Granted in 2015 [Member] | Minimum [Member]  
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 [Member] | Maximum [Member]  
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 [Member]  
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 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of unexercised options (in shares) 2,367,458
Director [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of unexercised options (in shares) 6,000
Director [Member] | Stock Options [Member]  
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 [Member] | Manager [Member] | Stock Options [Member]  
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 [Member] | Manager [Member] | Stock Options [Member]  
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 | $ $ 3.4
2014 [Member] | Manager [Member] | Stock Options [Member]  
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 | $ $ 4.8
2015 [Member] | Manager [Member] | Stock Options [Member]  
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) 7,218,165
Weighted average exercise price (in dollars per share) | $ / shares $ 15.45
Intrinsic value of exercisable options | $ $ 1.5
2016 [Member] | Manager [Member] | Stock Options [Member]  
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) 666,667
Weighted average exercise price (in dollars per share) | $ / shares $ 14.20
Intrinsic value of exercisable options | $ $ 0.9
2017 [Member] | Manager [Member] | Stock Options [Member]  
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) 753,944
Weighted average exercise price (in dollars per share) | $ / shares $ 15.00
Intrinsic value of exercisable options | $ $ 0.4