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INTEREST RATE SWAP AGREEMENTS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Derivative
Dec. 31, 2012
Derivative
Dec. 31, 2011
INTEREST RATE SWAP AGREEMENTS      
Number of interest rate swap agreements outstanding 4 5  
Interest rate swaps designated as cash flow hedges      
Notional amount outstanding $ 306,233 $ 356,233  
Interest expense pertaining to the interest rate swaps 9,963 13,440 28,854
Interest Rate Swap, 4.485% [Member]
      
Interest rate swaps designated as cash flow hedges      
Fixed rate (as a percent) (in hundredths) 4.485%    
Notional amount outstanding 106,233 106,233  
Interest Rate Swap, 5.25% [Member]
      
Interest rate swaps designated as cash flow hedges      
Fixed rate (as a percent) (in hundredths) 5.25%    
Notional amount outstanding 50,000 50,000  
Interest Rate Swap, 5.075% [Member]
      
Interest rate swaps designated as cash flow hedges      
Fixed rate (as a percent) (in hundredths) 5.075%    
Notional amount outstanding 0 50,000  
Interest Rate Swap, 2.05% [Member]
      
Interest rate swaps designated as cash flow hedges      
Fixed rate (as a percent) (in hundredths) 2.05%    
Notional amount outstanding 100,000 100,000  
Interest Rate Swap, 2.45% [Member]
      
Interest rate swaps designated as cash flow hedges      
Fixed rate (as a percent) (in hundredths) 2.45%    
Notional amount outstanding $ 50,000 $ 50,000