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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
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Oil And Gas Information [Abstract]      
Balance, beginning of year $ 34,531 $ 38,708 $ 45,354
Sales, net of production costs and taxes (1,901) (8,385) (10,471)
Discoveries and extensions, net of costs 5 4,231 4,047
Sale of reserves in place     (767)
Net changes in prices and production costs (16,009) (829) (1,277)
Revisions of quantity estimates (22,431) (6,610) (4,306)
Previously estimated development cost incurred during the year   508 3,149
Changes in future development costs 4,890 (1,913) (1,392)
Changes in production rates (timing) and other (56) 1,312 368
Accretion of discount 3,373 4,247 4,593
Net change in income taxes 5,885 3,262 (590)
Balance, end of year $ 8,287 $ 34,531 $ 38,708