CAPITAL STOCK AND STOCK AWARD PLANS - Summary of Stock Options Grants by First Vesting Date (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted, Net of Forfeitures (in shares)	5,173,807
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 14.67
Unvested Options (in shares)	3,494,615
First Vesting Date - Dec 31 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted, Net of Forfeitures (in shares)	1,421,933
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 12.66
Unvested Options (in shares)	561,579
First Vesting Date - Dec 31 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted, Net of Forfeitures (in shares)	1,246,480
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 12.60
Unvested Options (in shares)	735,744
First Vesting Date - Dec 31 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted, Net of Forfeitures (in shares)	1,470,606
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 14.25
Unvested Options (in shares)	1,162,504
First Vesting Date - Dec 31 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted, Net of Forfeitures (in shares)	1,034,788
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 20.52
Unvested Options (in shares)	1,034,788
Performance Shares | First Vesting Date - Dec 31 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted, Net of Forfeitures (in shares)	1,253,443
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 14.17
Unvested Options (in shares)	136,781