Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements Fair Value Of Financial Instruments (Details 2) (Details)

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Fair Value Measurements Fair Value Of Financial Instruments (Details 2) (Details)
$ in Millions
Dec. 31, 2014
USD ($)
Mammoth Energy Partners LP  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Equity Method Investments, Fair Value Disclosure $ 143.5