EMPLOYEE BENEFIT PLANS (Details) (PLC, USD $)	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Dec. 31, 2014
EMPLOYEE BENEFIT PLANS
Threshold age plus vesting period of active employees to determine type of benefit eligibility		55 years
Adjusted funding target percentage to be maintained, minimum		80.00%
Percentage of funded status to be maintained for PBGC reporting purposes		80.00%
Minimum
EMPLOYEE BENEFIT PLANS
Estimated contribution by employer		$ 1,000,000
Maximum
EMPLOYEE BENEFIT PLANS
Estimated contribution by employer		10,000,000
2014 plan year
EMPLOYEE BENEFIT PLANS
Contribution made by the company to its defined benefit pension plan	2,200,000	6,500,000
2013 plan year
EMPLOYEE BENEFIT PLANS
Contribution made by the company to its defined benefit pension plan		$ 9,000,000