EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Jan. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2016
Defined Benefit Pension Plan | Minimum
EMPLOYEE BENEFIT PLANS
Adjusted funding target percentage to be maintained					80.00%
Successor | Defined Benefit Pension Plan
EMPLOYEE BENEFIT PLANS
Service cost — benefits earned during the period		$ 2,906	$ 2,973	$ 7,928	$ 8,717
Interest cost on projected benefit obligation		2,737	2,433	6,488	8,210
Expected return on plan assets		(3,605)	(3,642)	(9,712)	(10,816)
Amortization of prior service cost		0	0	0	0
Amortization of actuarial losses		0	0	0	0
Preliminary net periodic benefit cost		2,038	1,764	4,704	6,111
Settlement/curtailment expense		0	0	0	0
Total net periodic benefit costs		2,038	1,764	4,704	6,111
Successor | Excess Benefit Plan
EMPLOYEE BENEFIT PLANS
Service cost — benefits earned during the period		311	333	888	1,102
Interest cost on projected benefit obligation		299	408	1,088	1,054
Expected return on plan assets		0	0	0	0
Amortization of prior service cost		0	0	0	0
Amortization of actuarial losses		64	0	0	114
Preliminary net periodic benefit cost		674	741	1,976	2,270
Settlement/curtailment expense		635	0	0	2,135
Total net periodic benefit costs		$ 1,309	$ 741	$ 1,976	4,405
Predecessor | Defined Benefit Pension Plan
EMPLOYEE BENEFIT PLANS
Service cost — benefits earned during the period	$ 974
Interest cost on projected benefit obligation	1,002
Expected return on plan assets	(1,293)
Amortization of prior service cost	(33)
Amortization of actuarial losses	668
Preliminary net periodic benefit cost	1,318
Settlement/curtailment expense	0
Total net periodic benefit costs	1,318
Predecessor | Excess Benefit Plan
EMPLOYEE BENEFIT PLANS
Service cost — benefits earned during the period	95
Interest cost on projected benefit obligation	140
Expected return on plan assets	0
Amortization of prior service cost	1
Amortization of actuarial losses	138
Preliminary net periodic benefit cost	374
Settlement/curtailment expense	0
Total net periodic benefit costs	$ 374
PLC | Successor
EMPLOYEE BENEFIT PLANS
Pension contributions					$ 1,900