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Basis of Presentation and Significant Accounting Policies (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Excise and Sales Taxes $ 9,500,000 $ 32,200,000 $ 21,000,000 $ 60,800,000  
Restricted Cash and Investments [Abstract]          
Restricted Cash and Investments, Current 3,600,000   3,600,000   3,600,000
Restricted Cash and Investments, Noncurrent 8,200,000   8,200,000   7,800,000
Goodwill [Roll Forward]          
Beginning balance, January 1     31,094,000    
Goodwill, Acquired During Period     560,000    
Ending balance, June 30 $ 31,654,000   $ 31,654,000