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Related Parties
9 Months Ended
Sep. 30, 2015
Related Party Transactions [Abstract]  
Related Parties
RELATED PARTIES

At September 30, 2015, Mitsubishi Corporation owned a 25% interest in SCI, which owns Marathon and its related properties located in northern Ontario, Canada. The Company made PGM sales of $15.2 million and $24.9 million to Mitsubishi in the three-month periods ended September 30, 2015 and 2014, respectively, and $38.7 million and $118.7 million, respectively, for the nine-month periods ended September 30, 2015 and 2014, respectively.