Accounts Receivable

3 Months Ended

Mar. 31, 2013

Receivables [Abstract]

Accounts Receivable

Accounts Receivable

Accounts receivable are carried at their estimated collectible amounts. Accounts receivable include trade receivables of $44.0 million and other receivables of $17.3 million as of March 31, 2013. Accounts receivable as of December 31, 2012 included trade receivables of $34.6 million and other receivables of $18.3 million. Other receivables primarily consist of $13.8 million and $12.9 million of Canadian Harmonized Sales Tax refundable to TCM as of March 31, 2013 and December 31, 2012, respectively.