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Fair Value Measurements (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2012
Fair Value Measurements      
Amount outstanding under revolving credit agreement $ 14,820,000   $ 19,700,000
Long-lived assets held and used, losses 4,329,000 15,687,000  
Nonrecurring
     
Fair Value Measurements      
Long-lived assets held and used, losses 4,329,000    
Total
     
Fair Value Measurements      
Available-for-sale securities 768,000   680,000
Total | Nonrecurring
     
Fair Value Measurements      
Long-lived assets held and used 26,000,000    
Level 1
     
Fair Value Measurements      
Available-for-sale securities 768,000   680,000
Level 3 | Nonrecurring
     
Fair Value Measurements      
Long-lived assets held and used $ 26,000,000