Accounts Receivable

3 Months Ended

Mar. 31, 2013

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 $7.1 million and $6.6 million at March 31, 2013 and December 31, 2012, respectively.