Summary of Significant Accounting Policies, Derivatives by Hedging Relationship and Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified											3 Months Ended		9 Months Ended
	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 1 Quoted Prices [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 Quoted Prices [Member]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 2 Observable [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2 Observable [Member]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 3 Unobservable [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 Unobservable [Member]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Counterparty Offsets [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Counterparty Offsets [Member]	Sep. 30, 2014 Commodity Contract [Member] Revenues - Marketing [Member] Not Designated as Hedging Instrument [Member]	Sep. 30, 2013 Commodity Contract [Member] Revenues - Marketing [Member] Not Designated as Hedging Instrument [Member]	Sep. 30, 2014 Commodity Contract [Member] Revenues - Marketing [Member] Not Designated as Hedging Instrument [Member]	Sep. 30, 2013 Commodity Contract [Member] Revenues - Marketing [Member] Not Designated as Hedging Instrument [Member]
Earnings (loss) recognized in income [Abstract]
Earnings (Loss)											$ (74)	$ (72)	$ 310	$ (73)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - Current assets	117	395	0	0	117	449	0	0	0	(54)
Derivatives - Current liabilities	(127)	0	0	0	(127)	(54)	0	0	0	54
Net Value	$ (10)	$ 395	$ 0	$ 0	$ (10)	$ 395	$ 0	$ 0	$ 0	$ 0