BENEFIT PLANS, Benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation for defined benefit pension plan prior to plan revaluation	$ 99,600,000	$ 111,500,000
Accumulated other comprehensive income (loss), negative postretirement medical plan amendment, arising during period, net of tax				3,500,000
Amounts recognized in AOCI, net of tax [Abstract]
Total	(20,640,000)	2,911,000	10,581,000
Prior service costs [Abstract]
Maximum percentage of net gain or loss over the greater of the projected benefit obligation or the market-related value of assets without requiring amortization (hundredths)	10.00%
Pension Benefits [Member]
Amounts recognized in AOCI, net of tax [Abstract]
Prior service cost	(46,000)	90,000
Net (gain) loss	(20,513,000)	2,368,000
Total	(20,559,000)	2,458,000
Costs that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in net periodic (income) cost in next fiscal year [Abstract]
Prior service cost	5,000
Net loss	(308,000)
Total	(303,000)
Weighed average assumption used in calculating benefit obligations [Abstract]
Discount rate (in hundredths)	5.00%	3.40%
Expected return on plan assets (in hundredths)	7.00%	7.00%
Rate of compensation increase (in hundredths)	3.50%	3.50%
Net periodic benefit cost [Abstract]
Service cost	3,988,000	3,392,000	2,959,000
Interest cost	4,120,000	4,393,000	4,497,000
Expected return on plan assets	(10,149,000)	(9,196,000)	(8,097,000)
Amortization of unrecognized net loss	4,028,000	3,687,000	2,362,000
Amortization of prior service cost	75,000	(147,000)	(149,000)
Net periodic benefit cost	2,062,000	2,129,000	1,572,000
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate (in hundredths)	3.40%	4.10%	4.40%
Expected return on plan assets (in hundredths)	7.00%	7.50%	7.50%
Rate of compensation increase (in hundredths)	3.50%	4.00%	4.00%
Post-retirement Benefits [Member]
Amounts recognized in AOCI, net of tax [Abstract]
Prior service cost	109,000	503,000
Net (gain) loss	(190,000)	(51,000)
Total	(81,000)	452,000
Costs that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in net periodic (income) cost in next fiscal year [Abstract]
Prior service cost	(179,000)
Net loss	1,000
Total	(178,000)
Weighed average assumption used in calculating benefit obligations [Abstract]
Discount rate (in hundredths)	4.80%	3.20%
Net periodic benefit cost [Abstract]
Service cost	0	0	0
Interest cost	88,000	114,000	153,000
Expected return on plan assets	0	0	0
Amortization of unrecognized net loss	12,000	11,000	8,000
Amortization of prior service cost	(179,000)	(822,000)	(1,057,000)
Net periodic benefit cost	$ (79,000)	$ (697,000)	$ (896,000)
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate (in hundredths)	3.20%	3.90%	4.50%