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Long Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 23, 2011
Outstanding long-term debt      
Total long-term debt $ 116,951 $ 118,481  
Less: current maturities (8,196) (8,196)  
Total long-term debt, net of current maturities 108,755 110,285  
9.57% bond, due May 1, 2018 [Member]
      
Outstanding long-term debt      
Total long-term debt 5,442 6,348  
10.03% bond, due May 1, 2018 [Member]
      
Outstanding long-term debt      
Total long-term debt 2,993 3,492  
9.08% bond, due June 1, 2022 [Member]
      
Outstanding long-term debt      
Total long-term debt 7,960 7,958  
7.83% note, due January 1, 2015 [Member]
      
Outstanding long-term debt      
Total long-term debt 6,000 6,000  
6.64% note, due October 31, 2017 [Member]
      
Outstanding long-term debt      
Total long-term debt 16,363 16,363  
5.50% note, due October 12, 2020 [Member]
      
Outstanding long-term debt      
Total long-term debt 18,000 18,000  
5.93% note, due October 31, 2023 [Member]
      
Outstanding long-term debt      
Total long-term debt 30,000 30,000  
5.68% note, due June 30, 2026 [Member]
      
Outstanding long-term debt      
Total long-term debt 29,000 29,000 29,000
8.25% due March 1, 2014 [Member]
      
Outstanding long-term debt      
Total long-term debt 1,038 1,134  
Promissory note [Member]
      
Outstanding long-term debt      
Total long-term debt $ 155 $ 186