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Related Parties
3 Months Ended
Mar. 31, 2015
Related Party Transactions [Abstract]  
Related Parties
RELATED PARTIES

Mitsubishi owns a 25% interest in the Company's previously wholly-owned subsidiary, SCI, which owns Marathon and its related properties located in northern Ontario, Canada. The Company made PGM sales of $15.9 million and $48.0 million to Mitsubishi in the three-month periods ended March 31, 2015 and 2014, respectively.