Derivative Instruments (Details)	1 Months Ended	12 Months Ended
	Aug. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) item gal bbl	Dec. 31, 2015 USD ($) item gal
Derivative Instruments
Early Settlement of Commodity Derivatives	$ 8,745,000		$ 8,745,000
Derivative Assets
Derivative contracts - current, Gross Amount Recognized		$ 607,000	92,000
Derivative contracts - current, Gross Amounts Offset		(72,000)	(92,000)
Derivative contracts - current, Net Amounts Presented in the Balance Sheet		535,000
Derivative contracts - current, Net Amount		535,000
Derivative contracts - noncurrent, Gross Amount Recognized		263,000
Derivative contracts - noncurrent, Gross Amounts Offset		(1,000)
Derivative contracts - noncurrent, Net Amounts Presented in the Balance Sheet		262,000
Derivative contracts - noncurrent, Net amount		262,000
Derivative Liabilities
Derivative contracts - current, Gross Amount Recognized		72,000	450,000
Derivative contracts - current, Gross Amounts Offset		(72,000)	(92,000)
Derivative contracts - current , Net Amounts Presented in the Balance Sheet			358,000
Derivative contracts - current, Net Amount			358,000
Derivative contracts - noncurrent, Gross Amount Recognized		1,000	24,000
Derivative contracts - noncurrent, Gross Amounts Offset		$ (1,000)
Derivative contracts - noncurrent , Net Amounts Presented in the Balance Sheet			24,000
Derivative contracts - noncurrent, Net Amount			$ 24,000
Forward Contracts | Fixed Price Swap
Derivative Instruments
Notional amount (in gallons or barrels) | gal		4,364,880	8,614,631
Commodity swap contracts | Fixed Price Swap
Derivative Instruments
Notional amount			$ 93,000
Commodity swap contracts | Basis Swap
Derivative Instruments
Notional amount (in gallons or barrels) | bbl		180,000
Interest rate swap contracts
Derivative Instruments
Notional amount		$ 100,000,000
Number of derivative contracts | item			0
Derivatives designated as hedging contracts
Derivative Instruments
Number of derivative contracts | item		0
Derivatives not designated as hedging contracts | Commodity swap contracts | Prepaid expenses and other current assets
Derivative Instruments
Asset Derivatives		$ 607,000	$ 92,000
Derivatives not designated as hedging contracts | Commodity swap contracts | Deferred financing costs and other assets, net
Derivative Instruments
Asset Derivatives		37,000
Derivatives not designated as hedging contracts | Commodity swap contracts | Accrued liabilities.
Derivative Instruments
Liability Derivatives		(1,000)	(450,000)
Derivatives not designated as hedging contracts | Commodity swap contracts | Other long-term liabilities
Derivative Instruments
Liability Derivatives		(1,000)	(24,000)
Derivatives not designated as hedging contracts | Interest rate swap contracts | Deferred financing costs and other assets, net
Derivative Instruments
Asset Derivatives		226,000
Derivatives not designated as hedging contracts | Interest rate swap contracts | Accrued liabilities.
Derivative Instruments
Liability Derivatives		$ (71,000)
Held-for-sale | Mid-Continent Business | Forward Contracts | Current liabilities of discontinued operations held for sale
Derivative Instruments
Liability Derivatives			$ (630,000)