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Accounts Receivable
3 Months Ended
Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable are net of an allowance for doubtful accounts of $7.7 million at both March 31, 2014 and December 31, 2013.