SUBSEQUENT EVENTS - Special Equity Plan (Details) - shares		8 Months Ended	12 Months Ended
	May 19, 2017	Jan. 19, 2018	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted stock units
SUBSEQUENT EVENTS
Shares vested			400,000	400,000	400,000
Subsequent Events | Special Equity Plan
SUBSEQUENT EVENTS
Number of awards issued	1,117,228
Subsequent Events | Restricted stock units | Special Equity Plan
SUBSEQUENT EVENTS
Shares of common stock authorized	1,500,000
Number of additional common stock authorized	0
Maximum number of shares issuable	1,436,436
Subsequent Events | Incentive stock options | Special Equity Plan
SUBSEQUENT EVENTS
Number of awards issued	728,020
Options exercised		0
Subsequent Events | Performance-based stock units | Special Equity Plan
SUBSEQUENT EVENTS
Number of awards issued	319,208
Shares vested		0
Subsequent Events | Performance-based stock units | 10% CAGR Result on 3rd Anniversary of Grant Date | Minimum | Special Equity Plan
SUBSEQUENT EVENTS
CAGR Result on 3rd Anniversary of Grant Date (as percent)	10.00%
Percent of Target Performance-Based Restricted Stock Units Earned	50.00%
Subsequent Events | Performance-based stock units | 20% CAGR Result on 3rd Anniversary of Grant Date | Special Equity Plan
SUBSEQUENT EVENTS
CAGR Result on 3rd Anniversary of Grant Date (as percent)	20.00%
Percent of Target Performance-Based Restricted Stock Units Earned	100.00%
Subsequent Events | Performance-based stock units | 30% or above CAGR Result on 3rd Anniversary of Grant Date | Maximum | Special Equity Plan
SUBSEQUENT EVENTS
CAGR Result on 3rd Anniversary of Grant Date (as percent)	30.00%
Percent of Target Performance-Based Restricted Stock Units Earned	200.00%