EMPLOYEE BENEFIT PLANS (Details 2) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended	12 Months Ended
	Jan. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Defined Benefit Pension Plan
EMPLOYEE BENEFIT PLANS
Service cost - benefits earned during the period		$ 2,973		$ 4,955
Interest cost on projected benefit obligation		2,433		4,055
Expected return on plan assets		(3,642)		(6,070)
Total net periodic benefit cost		1,764		2,940
Unfunded Excess Benefits Plan
EMPLOYEE BENEFIT PLANS
Service cost - benefits earned during the period		333		555
Interest cost on projected benefit obligation		408		680
Total net periodic benefit cost		$ 741		$ 1,235
PLC | Defined Benefit Pension Plan
EMPLOYEE BENEFIT PLANS
Adjusted funding target percentage to be maintained, minimum				80.00%
Predecessor | Defined Benefit Pension Plan
EMPLOYEE BENEFIT PLANS
Service cost - benefits earned during the period	$ 974		$ 2,227		$ 4,454	$ 9,411
Interest cost on projected benefit obligation	1,002		2,587		5,174	10,493
Expected return on plan assets	(1,293)		(3,065)		(6,130)
Amortization of prior service cost	(33)		(98)		(196)
Amortization of actuarial losses	668		1,576		3,152
Total net periodic benefit cost	1,318		3,227		6,454
Contribution made by the company to its defined benefit pension plan	$ 2,165					15,513
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.55%
Predecessor | Unfunded Excess Benefits Plan
EMPLOYEE BENEFIT PLANS
Service cost - benefits earned during the period	$ 95		226		452	954
Interest cost on projected benefit obligation	140		406		812	1,696
Amortization of prior service cost	1		3		6
Amortization of actuarial losses	138		321		642
Total net periodic benefit cost	374		$ 956		$ 1,912
Contribution made by the company to its defined benefit pension plan	$ 122					$ 1,907
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.26%
Predecessor | Group life insurance plan
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.79%
Predecessor | PLC | Defined Benefit Pension Plan
EMPLOYEE BENEFIT PLANS
Contribution made by the company to its defined benefit pension plan	$ 2,200