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Accounts Receivable
6 Months Ended
Jun. 30, 2016
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable are net of allowances for doubtful accounts of $31.5 million, $24.9 million, and $24.4 million as of June 30, 2016June 30, 2015, and December 31, 2015, respectively.