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Goodwill and Other Intangibles Estimated Intangible Asset Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]            
October 1, 2013 through March 31, 2014 $ 2,270          
2015 3,699          
2016 4,208          
2017 2,221          
2018 1,993          
Subsequent years 12,063          
Amortizable Intangibles, Net 26,454          
Customer Relationships Intangible [Member]
           
Finite-Lived Intangible Assets [Line Items]            
October 1, 2013 through March 31, 2014 842          
2015 1,685          
2016 1,685          
2017 1,685          
2018 1,685          
Subsequent years 12,006          
Amortizable Intangibles, Net 19,588 20,010 20,431 21,273 21,695 22,116
Production and Supply Contract Intangibles [Member]
           
Finite-Lived Intangible Assets [Line Items]            
October 1, 2013 through March 31, 2014 818          
2015 1,173          
2016 1,812          
2017 0          
2018 0          
Subsequent years 0          
Amortizable Intangibles, Net 3,803 4,040 4,236 4,608 4,735 4,850
Internally Developed Software Intangible [Member]
           
Finite-Lived Intangible Assets [Line Items]            
October 1, 2013 through March 31, 2014 610          
2015 841          
2016 711          
2017 536          
2018 308          
Subsequent years 57          
Amortizable Intangibles, Net $ 3,063 $ 3,425 $ 4,010 $ 4,850 $ 5,365 $ 6,105