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Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value Measurements [Abstract]
Fair value and carrying value of debt	$ 6,000
Fair Value Measurements [Abstract]
Commodity risk management assets	1,002
Available for sale securities	258	$ 25
Total assets	1,260	25
Commodity risk management liability	0
Executive retirement program liability	786	1,309
Total liabilities	786	1,309
(Level 1) [Member]
Fair Value Measurements [Abstract]
Commodity risk management assets	0
Available for sale securities	20	25
Total assets	20	25
Commodity risk management liability	0
Executive retirement program liability	0	0
Total liabilities	0	0
(Level 2) [Member]
Fair Value Measurements [Abstract]
Commodity risk management assets	1,002
Available for sale securities	0	0
Total assets	1,002	0
Commodity risk management liability	0
Executive retirement program liability	0	0
Total liabilities	0	0
(Level 3) [Member]
Fair Value Measurements [Abstract]
Commodity risk management assets	0
Available for sale securities	238	0
Total assets	238	0
Commodity risk management liability	0
Executive retirement program liability	786	1,309
Total liabilities	$ 786	$ 1,309

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value of financial and nonfinancial obligations.

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