EMPLOYEE BENEFIT PLANS - Other Postretirement Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Jan. 31, 2015	Dec. 31, 2014
EMPLOYEE BENEFIT PLANS
Percentage change in healthcare cost trend assumptions which has no material effect on liability related to prescription drug benefit provided to employees	1.00%
Period for which average and annualized return on short treasury index considered for long term rate of return assumption assessment	25 years
Other Postretirement Benefits | Maximum
EMPLOYEE BENEFIT PLANS
Age of eligibility for limited healthcare benefits	65 years
Retiree medical plan | Minimum
EMPLOYEE BENEFIT PLANS
Age of eligibility for prescription drug benefit	65 years
Group life insurance plan
EMPLOYEE BENEFIT PLANS
Face amount of life insurance benefits funded	$ 50,000
Group life insurance plan | Minimum
EMPLOYEE BENEFIT PLANS
Life insurance benefits	10,000
Group life insurance plan | Maximum
EMPLOYEE BENEFIT PLANS
Life insurance benefits	75,000
Successor | Other Postretirement Benefits
EMPLOYEE BENEFIT PLANS
Accumulated benefit obligation, end of year	$ 100,000
Successor | Retiree medical plan
EMPLOYEE BENEFIT PLANS
Benefit obligation, discount rate (as a percent)	1.54%
Net periodic benefit cost, discount rate (as a percent)	1.27%
Successor | Group life insurance plan
EMPLOYEE BENEFIT PLANS
Benefit obligation, discount rate (as a percent)	4.60%
Net periodic benefit cost, discount rate (as a percent)	4.21%
Benefit obligation, expected long-term return on plan assets (as a percent)	2.75%
Net periodic benefit cost, expected long-term return on plan assets (as a percent)	3.14%
Predecessor | Other Postretirement Benefits
EMPLOYEE BENEFIT PLANS
Accumulated benefit obligation, end of year			$ 200,000
Predecessor | Retiree medical plan
EMPLOYEE BENEFIT PLANS
Liability related to prescription drug benefit provided to employees	$ 100,000
Predecessor | Group life insurance plan
EMPLOYEE BENEFIT PLANS
Benefit obligation, discount rate (as a percent)		3.79%