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Financial Instruments (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2013
Revolving credit agreement
Dec. 31, 2012
Revolving credit agreement
Sep. 30, 2013
Total
Dec. 31, 2012
Total
Sep. 30, 2013
Level 1
Dec. 31, 2012
Level 1
Financial Instruments                
Available-for-sale securities         $ 257,000 $ 239,000 $ 257,000 $ 239,000
Amount outstanding under revolving credit agreement     52,500,000 58,500,000        
Unrealized gains on interest rate swap $ 0 $ 83,000