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EMPLOYEE RETIREMENT PLANS (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%  
Defined Benefit Plan, Amortization of Net Gains (Losses) $ 1,600,000    
Defined Benefit Plan, Percentage of Minimum Fund Maintenance 80.00%    
Defined Contribution Plan, Employer Contribution Amount 221,000 212,000 200,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 111,000    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.75% 8.00% 8.00%
Equity Securities [Member]
      
Defined Benefit Plan, Actual Plan Asset Allocations 52.00% 42.00%  
Other Securities [Member]
      
Defined Benefit Plan, Actual Plan Asset Allocations 8.00% 9.00%  
Fixed Income Securities [Member]
      
Defined Benefit Plan, Actual Plan Asset Allocations 40.00% 49.00%  
Pension Plans, Defined Benefit [Member]
      
Defined Benefit Plan, Accumulated Benefit Obligation 38,200,000 35,300,000  
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax 6,735,000 6,575,000  
Supplemental Employee Retirement Plans, Defined Benefit [Member]
      
Defined Benefit Plan, Accumulated Benefit Obligation 11,600,000 12,000,000  
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax 2,102,000 2,487,000  
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax $ (402,000) $ 106,000  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.75%    
Minimum [Member] | Equity Securities [Member]
      
Defined Benefit Plan, Actual Plan Asset Allocations 20.00%    
Minimum [Member] | Other Securities [Member]
      
Defined Benefit Plan, Actual Plan Asset Allocations 0.00%    
Minimum [Member] | Fixed Income Securities [Member]
      
Defined Benefit Plan, Actual Plan Asset Allocations 20.00%    
Maximum [Member] | Equity Securities [Member]
      
Defined Benefit Plan, Actual Plan Asset Allocations 80.00%    
Maximum [Member] | Other Securities [Member]
      
Defined Benefit Plan, Actual Plan Asset Allocations 20.00%    
Maximum [Member] | Fixed Income Securities [Member]
      
Defined Benefit Plan, Actual Plan Asset Allocations 80.00%