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Accounts Receivable
3 Months Ended
Mar. 31, 2017
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
Accounts receivable are net of allowances for doubtful accounts of $23.3 million, $31.9 million, and $21.4 million as of March 31, 2017March 31, 2016, and December 31, 2016, respectively.