STOCKHOLDERS' DEFICIT - Stock Registration (Narrative) (Details) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Jul. 27, 2015	Jun. 24, 2015
Executive Long-Term Incentive Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares registered under Incentive Plan (in shares)			1,253,831
Common Class A
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares registered under Incentive Plan (in shares)	400,000,000	400,000,000
Par value (in dollars per share)	$ 0.001	$ 0.001
Common Class A | Executive Long-Term Incentive Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares registered under Incentive Plan (in shares)				4,000,000
Par value (in dollars per share)				$ 0.001