Oil and Gas Disclosures (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Oil And Gas Disclosures - Changes In Standardized Measure Of Discounted Future Net Cash Flows Details
Standardized measure - beginning of year	$ 4,250	$ 835
Sales of oil and gas, net	(770)	(884)
Net change in prices and production costs	(435)	(64)
Net change in future development costs	2,509
Extensions and discoveries	353	3,925
Revisions of previous quantity estimates	(2,155)	93
Previously estimated development costs incurred	269
Accretion of discount	425us-gaap_AccretionOfDiscount	83us-gaap_AccretionOfDiscount
Sales of reserves	(561)
Other	(189)	262
Standardized measure - end of year	$ 3,696	$ 4,250

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time.

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Amount of decrease in standardized measure of discounted future net cash flow as a result of sales of minerals in place.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in estimated future development costs.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in sales and transfer prices and in production (lifting) costs related to future production.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of revisions of estimated quantity of oil and gas in proved reserves.

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Amount of (increase) decrease in standardized measure of discounted future net cash flow as a result of sales and transfers of oil and gas produced.

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Amount of standardized measure of discounted future net cash flow relating to proved oil and gas reserves.

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