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Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Event	12. Subsequent Event On October 29, 2015, the Company entered into an agreement to acquire GreenHaven Commodity Services, LLC, the managing owner of the GreenHaven Continuous Commodity Index Fund (NYSE Arca: GCC), and GreenHaven Coal Services, LLC, the sponsor of the GreenHaven Coal Fund (NYSE Arca: TONS), from GreenHaven, LLC and GreenHaven Group LLC, respectively, for approximately $11,839 in cash. The transaction closed on January 4, 2016 with an effective date of January 1, 2016. The Company has retained GreenHaven Advisors, LLC as the sub-advisor to the funds to conduct portfolio management services. In January and February 2016, the Company repurchased 3.4 million shares of its common stock under its share repurchase program for an aggregate cost of $35.6 million.