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Derivatives (Details) (Interest Rate Swap [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Interest Rate Swap [Member]
   
Derivative [Line Items]    
Percentage of Debt Hedged by Interest Rate Swap 8.00%  
Interest Rate Swap Variable Rate Basis one-month LIBOR  
Interest Rate Swap Fixed Interest Rate 0.825%  
Discussion of Interest Rate Cash Flow Hedge Effectiveness Assessment and Measurement The shortcut method is used to assess hedge effectiveness. At inception, all shortcut method requirements were satisfied; thus changes in value of the Swap designated as the hedging instrument will be deemed 100 percent effective. As a result, there was no ineffectiveness recorded for the year ended December 31, 2012.  
Interest Rate Swap Liability $ (0.7) $ (0.4)