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Accounts Receivable Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2014
customer
Dec. 31, 2013
customer
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number Of Customers With Greater Than Ten Percent Accounts Receivable Balance 2 2
Concentration Risk, Percentage 36.00% 36.00%
Customer One
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration Risk, Percentage 15.00% 12.00%
Customer Two
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Concentration Risk, Percentage 14.00% 10.00%