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Accounts Receivable
6 Months Ended
Jun. 30, 2017
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable are net of allowances for doubtful accounts of $23.0 million, $31.5 million, and $21.4 million as of June 30, 2017June 30, 2016, and December 31, 2016, respectively.