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Other Intangibles (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill [Line Items]      
Intangible assets estimated useful life 11.5    
Finite-Lived Intangible Assets, Gross   $ 12,430,000  
Amortization of Intangible Assets 1,100,000 1,100,000 1,000,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 1,100,000    
Finite-Lived Intangible Assets, Accumulated Amortization (6,822,000) (5,759,000)  
Indefinite-Lived Intangible Assets (Excluding Goodwill) 7,025,000 3,557,000  
Intangible Assets, Gross (Excluding Goodwill) 19,252,000 15,784,000  
Intangible Assets, Net (Excluding Goodwill) 12,430,000 10,025,000  
Supply contracts [Member]
      
Goodwill [Line Items]      
Intangible assets estimated useful life 11.5 years 11.5 years  
Finite-Lived Intangible Assets, Gross 12,227,000 12,227,000  
Finite-Lived Intangible Assets, Net $ 5,405,000 $ 6,468,000