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Supplemental Oil And Gas Information (Schedule Of Standardized Measure Of Discounted Futures Net Cash Flows From Proved Oil And Gas Reserves) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Oil And Gas Information [Abstract]
Future cash inflows	$ 194,941	$ 229,366	$ 180,569
Future production costs and taxes	(82,069)	(82,086)	(70,771)
Future development costs	(7,894)	(12,611)	(13,283)
Future income tax expenses	(19,472)	(34,750)
Future net cash flows	85,506	99,919	96,515
Discount at 10% for timing of cash flows	(40,152)	(48,010)	(48,171)
Standardized measure of discounted future net cash flows	$ 45,354	$ 51,909	$ 48,344

This is the amount that is derived from using a discount rate of ten percent a year to reflect the timing of the future net cash flows relating to proved oil and gas reserves.

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- Definition

The estimated future income tax expenses that will be incurred based on the future income less future expenses derived from production and sale of proved oil and gas reserves in this geographic region.

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- Definition

These amounts are the result of subtracting future development and production costs and future income tax expenses from future cash inflows for each geographic region where proved oil and gas reserves exist.

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