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Accounts Receivable
9 Months Ended
Sep. 30, 2019
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable are net of allowances for doubtful accounts of $22.4 million, $23.4 million, and $22.0 million as of September 30, 2019September 30, 2018, and December 31, 2018, respectively.