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Accounts Receivable
6 Months Ended
Jun. 30, 2014
Accounts Receivable
2. Accounts Receivable

Accounts receivable are net of allowances for doubtful accounts of $21.4 million, $35.9 million, and $20.4 million as of June 30, 2014, June 30, 2013, and December 31, 2013, respectively.