EMPLOYEE BENEFIT PLANS (Details) (PLC, USD $)	3 Months Ended			1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 2013 plan year	Apr. 30, 2014 2014 plan year
EMPLOYEE BENEFIT PLANS
Service cost - benefits earned during the period	$ 2,453,000	$ 2,708,000
Interest cost on projected benefit obligation	2,993,000	2,553,000
Expected return on plan assets	(3,065,000)	(2,759,000)
Amortization of prior service cost/(credit)	(95,000)	(95,000)
Amortization of actuarial losses	1,897,000	2,729,000
Total benefit cost	4,183,000	5,136,000
Contribution made by the company to its defined benefit pension plan			$ 2,300,000	$ 3,100,000
Adjusted funding target percentage to be maintained, minimum	80.00%
Age of eligibility for prescription drug benefit	65 years