EMPLOYEE BENEFIT PLANS (Details 2) (PLC, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Pension Plan
EMPLOYEE BENEFIT PLANS
Accumulated benefit obligation, end of year	$ 207,999	$ 210,319
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	223,319	199,162
Service cost	9,345	9,145	8,682
Interest cost	8,985	8,977	8,938
Actuarial (gain) or loss	(8,172)	15,286
Benefits paid	(14,325)	(9,251)
Projected benefit obligation at end of year	219,152	223,319	199,162
Change in plan assets:
Fair value of plan assets at beginning of year	152,187	125,058
Actual return on plan assets	33,368	15,202
Employer contributions	8,943	21,178
Benefits paid	(14,325)	(9,251)
Fair value of plan assets at end of year	180,173	152,187	125,058
After reflecting FASB guidance:
Funded status	(38,979)	(71,132)
Amounts recognized in the balance sheet:
Other liabilities	(38,979)	(71,132)
Amounts recognized in accumulated other comprehensive income:
Net actuarial loss	54,897	95,055
Prior service cost/(credit)	(1,425)	(1,816)
Net transition asset	53,472	93,239
Unfunded Excess Benefits Plan
EMPLOYEE BENEFIT PLANS
Accumulated benefit obligation, end of year	36,306	39,828
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	42,971	36,256
Service cost	1,037	867	679
Interest cost	1,387	1,473	1,506
Actuarial (gain) or loss	(1,505)	6,946
Benefits paid	(4,211)	(2,571)
Projected benefit obligation at end of year	39,679	42,971	36,256
Change in plan assets:
Employer contributions	4,211	2,571
Benefits paid	(4,211)	(2,571)
After reflecting FASB guidance:
Funded status	(39,679)	(42,971)
Amounts recognized in the balance sheet:
Other liabilities	(39,679)	(42,971)
Amounts recognized in accumulated other comprehensive income:
Net actuarial loss	13,346	17,571
Prior service cost/(credit)	36	48
Net transition asset	13,382	17,619
Retiree medical plan
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	788	949
Service cost	4	6
Interest cost	5	17
Actuarial (gain) or loss	29	(144)
Plan participant contributions	289	293
Benefits paid	(668)	(333)
Projected benefit obligation at end of year	447	788
Change in plan assets:
Benefits paid	(668)	(333)
Group life insurance plan
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	10,070	8,951
Service cost	144	123
Interest cost	405	412
Actuarial (gain) or loss	(1,620)	895
Benefits paid	(346)	(311)
Projected benefit obligation at end of year	8,653	10,070
Change in plan assets:
Benefits paid	$ (346)	$ (311)