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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Long-term debt    
Long-term debt $ 40.0 $ 35.0
Less current portion (5.0) (5.0)
Long-term debt, Total 35.0 30.0
Revolving credit [Member]
   
Long-term debt    
Long-term debt 25.0 20.0
Promissory note [Member]
   
Long-term debt    
Long-term debt $ 15.0 $ 15.0