Taxes (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Payable pursuant to tax receivable agreement—affiliates	$ 20,767	$ 20,767
Income tax rate	6.50%
NuDevco Retail Holdings and NuDevco Retail
Related Party Transaction [Line Items]
Net deferred tax asset	$ 15,600
Payable pursuant to tax receivable agreement—affiliates	20,800
Long-term deferred tax asset	$ 7,500