EMPLOYEE BENEFIT PLANS (Details 3) (USD $)	1 Months Ended			12 Months Ended
	Jun. 30, 2013 acre	Nov. 30, 2012 acre	Apr. 30, 2011 acre	Dec. 31, 2013 plan acre	Dec. 31, 2012	Oct. 31, 2011 plan	Dec. 31, 2009
EMPLOYEE BENEFIT PLANS
Expected contribution to the defined benefit pension plans in the next fiscal year				$ 2,800,000
Estimated future benefit payments
2014				4,465,000
2015				4,430,000
2016				4,433,000
2017				4,463,000
2018				4,498,000
2019 - 2023				22,493,000
Security to support the unfunded liabilities of the Bargaining Plan							5,200,000
Area of property pledged as security (in acres)		7,000	1,400
Period for release of property pledged as collateral		5 years	5 years
Additional security to support unfunded liabilities						18,700,000
Number of pension plans						2
Area of parcel proposed to be sold (in acres)	270
Unfunded pension fund liabilities				20,900,000
Area of property held as collateral for unfunded pension obligations (in acres)				8,400
Carrying value of property held as collateral for unfunded pension obligations				1,800,000
Minimum number of investment and savings plans in which the majority of employees are eligible to participate				1
Company contributions				0	0
Deferred compensation plan liabilities				$ 340,000	$ 512,000