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Goodwill and Other Intangibles Estimated Intangible Asset Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Finite-Lived Intangible Assets [Line Items]            
2013 $ 3,541          
2014 4,735          
2015 3,441          
2016 3,313          
2017 1,984          
Later 13,717          
Amortizable Intangibles, Net 30,731          
Customer Relationships Intangible [Member]
           
Finite-Lived Intangible Assets [Line Items]            
2013 842          
2014 1,685          
2015 1,685          
2016 1,685          
2017 1,685          
Later 13,691          
Amortizable Intangibles, Net 21,273 21,695 22,116 22,958 23,380 23,801
Production and Supply Contract Intangibles [Member]
           
Finite-Lived Intangible Assets [Line Items]            
2013 1,009          
2014 1,251          
2015 1,173          
2016 1,175          
2017 0          
Later 0          
Amortizable Intangibles, Net 4,608 4,735 4,850 5,579 5,701 5,945
Internally Developed Software Intangible [Member]
           
Finite-Lived Intangible Assets [Line Items]            
2013 1,690          
2014 1,799          
2015 583          
2016 453          
2017 299          
Later 26          
Amortizable Intangibles, Net $ 4,850 $ 5,365 $ 6,105 $ 6,990 $ 8,109 $ 8,665