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Long-Term Debt (Schedule Of Long-Term Debt To Unrelated Entities) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Note payable to financial institution, with interest only payment until maturity $ 8,191 $ 10,138
Installment notes bearing interest at the rate of 5.5% to 8.25% per annum collateralized by vehicles with monthly payments including interest, insurance and maintenance of approximately $20,000 184 208
Total long-term debt 8,375 10,346
Less current maturities (92) (100)
Long-term debt, less current maturities 8,283 10,246
Periodic payments including interest, insurance and maintenance $ 20,000  
Maximum [Member]
    
Line of Credit Facility [Line Items]    
Interest rate per annum 8.25%  
Minimum [Member]
    
Line of Credit Facility [Line Items]    
Interest rate per annum 5.50%