EMPLOYEE BENEFIT PLANS (Details) - 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
Change in projected benefit obligation:
Service cost		$ 2,973		$ 4,955
Interest cost		2,433		4,055
Unfunded Excess Benefits Plan
Change in projected benefit obligation:
Service cost		333		555
Interest cost		$ 408		680
Predecessor | Defined Benefit Pension Plan
EMPLOYEE BENEFIT PLANS
Accumulated benefit obligation, end of year	$ 262,290					$ 249,453
Change in projected benefit obligation:
Projected benefit obligation at beginning of period	267,331			281,099	$ 219,152	219,152
Service cost	974		$ 2,227		4,454	9,411
Interest cost	1,002		2,587		5,174	10,493
Actuarial (gain) or loss	12,384					38,110
Benefits paid	(592)					(9,835)
Projected benefit obligation at end of period	281,099					267,331
Change in plan assets:
Fair value of plan assets at beginning of period	203,772			201,820	180,173	180,173
Actual return on plan assets	(3,525)					17,921
Employer contributions	2,165					15,513
Benefits paid	(592)					(9,835)
Fair value of plan assets at end of period	201,820					203,772
After reflecting FASB guidance:
Funded status	(79,279)					(63,559)
Amounts recognized in the balance sheet:
Other liabilities	(79,279)					(63,559)
Amounts recognized in accumulated other comprehensive income:
Net actuarial loss	96,965					80,430
Prior service cost/(credit)	(1,001)					(1,033)
Total amounts recognized in AOCI	95,964					79,397
Predecessor | Unfunded Excess Benefits Plan
EMPLOYEE BENEFIT PLANS
Accumulated benefit obligation, end of year	49,251					47,368
Change in projected benefit obligation:
Projected benefit obligation at beginning of period	49,575			51,243	39,679	39,679
Service cost	95		226		452	954
Interest cost	140		$ 406		$ 812	1,696
Actuarial (gain) or loss	1,555					9,153
Benefits paid	(122)					(1,907)
Projected benefit obligation at end of period	51,243					49,575
Change in plan assets:
Employer contributions	122					1,907
Benefits paid	(122)					(1,907)
After reflecting FASB guidance:
Funded status	(51,243)					(49,575)
Amounts recognized in the balance sheet:
Other liabilities	(51,243)					(49,575)
Amounts recognized in accumulated other comprehensive income:
Net actuarial loss	22,401					20,983
Prior service cost/(credit)	23					24
Total amounts recognized in AOCI	22,424					21,007
Predecessor | Group life insurance plan
Change in projected benefit obligation:
Projected benefit obligation at beginning of period	9,300			$ 9,800
Projected benefit obligation at end of period	9,800					$ 9,300
Predecessor | PLC | Defined Benefit Pension Plan
Change in plan assets:
Employer contributions	$ 2,200