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Accounts Receivable
9 Months Ended
Sep. 30, 2016
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable are net of allowances for doubtful accounts of $30.9 million, $26.0 million, and $24.4 million as of September 30, 2016September 30, 2015, and December 31, 2015, respectively.