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TRADE ACCOUNTS RECEIVABLE (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for doubtful accounts $ (1,157,000) $ (2,074,000)  
Total accounts receivable - net 50,017,000 48,019,000  
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance - beginning of year 2,074,000 2,418,000 2,660,000
Provision for bad debts (285,000) 22,000 274,000
Charge-offs (632,000) (565,000) (1,100,000)
Recoveries 0 199,000 329,000
Balance - end of year 1,157,000 2,074,000 2,418,000
Unbilled [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable 6,800,000 5,723,000  
Billed [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable $ 44,374,000 $ 44,370,000