Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Liabilities:
Asset retirement obligation capitalized	$ 5,736	$ 5,713
Mammoth Energy Partners LP [Member]
Liabilities:
Equity investment			$ 143,500
Level 1 [Member]
Assets:
Derivative Instruments	167,271
Liabilities:
Derivative Instruments	5,559
Level 2 [Member]
Assets:
Derivative Instruments	0
Liabilities:
Derivative Instruments	0
Level 3 [Member]
Assets:
Derivative Instruments	0
Liabilities:
Derivative Instruments	0
Asset retirement obligation capitalized	$ 5,700
Level 3 [Member] | Mammoth Energy Partners LP [Member]
Liabilities:
Equity investment			$ 143,500