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Supplemental Oil And Gas Information (Schedule Of Changes In The Standardized Measure Of Discounted Future Net Cash Flows From Proved Oil And Gas Reserves) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplemental Oil And Gas Information [Abstract]      
Balance, beginning of year $ 45,354 $ 51,909 $ 48,344
Sales, net of production costs and taxes (10,471) (14,275) (11,552)
Discoveries and extensions, net of costs 4,047 6,967 10,923
Purchase of reserves in place         
Sale of reserves in place (767)      
Net changes in prices and production costs (1,277) (6,067) 15,428
Revisions of quantity estimates (4,306) (9,883) 343
Previously estimated development cost incurred during the year 3,149 8,760 5,346
Changes in future development costs (1,392) (1,919) (1,109)
Changes in production rates (timing) and other 368 (5,657) (2,336)
Accretion of discount 4,593 6,223 4,376
Net change in income taxes (590) 9,296 (17,854)
Balance, end of year $ 38,708 $ 45,354 $ 51,909