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Accounting Policies Accounts Receivable (Details) (Accounts Receivable [Member], Customer Concentration Risk [Member], Largest Two Customers [Member])
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Largest Two Customers [Member]
   
Concentration Risk [Line Items]    
Concentration Risk, Percentage 27.20% 18.90%