EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended
	Jan. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2015	Jun. 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	$ 4,955	$ 5,812
Interest cost on projected benefit obligation		2,737	2,433	4,055	5,474
Expected return on plan assets		(3,605)	(3,642)	(6,070)	(7,211)
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	2,940	4,075
Settlement/curtailment expense		0	0	0	0
Total net periodic benefit costs		2,038	1,764	2,940	4,075
Successor | Excess Benefit Plan
EMPLOYEE BENEFIT PLANS
Service cost — benefits earned during the period		313	333	555	625
Interest cost on projected benefit obligation		438	408	680	877
Expected return on plan assets		0	0	0	0
Amortization of prior service cost		0	0	0	0
Amortization of actuarial losses		0	0	0	0
Preliminary net periodic benefit cost		751	741	1,235	1,502
Settlement/curtailment expense		1,500	0	0	1,500
Total net periodic benefit costs		$ 2,251	$ 741	$ 1,235	$ 3,002
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