EMPLOYEE BENEFIT PLANS (Details) (USD $) In Thousands, unless otherwise specified	2 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Jan. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Defined Benefit Pension Plan
Change in projected benefit obligation:
Service cost	$ 2,577
Interest cost	2,652
Unfunded Excess Benefits Plan
Change in projected benefit obligation:
Service cost	252
Interest cost	371
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	219,152	219,152
Service cost		974	2,227	9,411
Interest cost		1,002	2,587	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	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)
Net transition asset		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	39,679	39,679
Service cost		95	226	954
Interest cost		140	406	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
Net transition asset		22,424		21,007
Predecessor | Group life insurance plan
Change in projected benefit obligation:
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