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Goodwill and Other Intangibles Estimated Intangible Asset Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Finite-Lived Intangible Assets [Line Items]        
2013 $ 4,827      
2014 4,686      
2015 3,392      
2016 3,264      
2017 1,935      
Later 13,691      
Amortizable Intangibles, Net 31,795      
Customer Relationships Intangible [Member]
       
Finite-Lived Intangible Assets [Line Items]        
2013 1,264      
2014 1,685      
2015 1,685      
2016 1,685      
2017 1,685      
Later 13,691      
Amortizable Intangibles, Net 21,695 22,116 23,380 23,801
Production and Supply Contract Intangibles [Member]
       
Finite-Lived Intangible Assets [Line Items]        
2013 1,136      
2014 1,251      
2015 1,173      
2016 1,175      
2017 0      
Later 0      
Amortizable Intangibles, Net 4,735 4,850 5,701 5,945
Internally Developed Software Intangible [Member]
       
Finite-Lived Intangible Assets [Line Items]        
2013 2,427      
2014 1,750      
2015 534      
2016 404      
2017 250      
Later 0      
Amortizable Intangibles, Net $ 5,365 $ 6,105 $ 8,109 $ 8,665