Supplemental Oil And Gas Information (Schedule Of Reserve Value By Category And The Respective Present Values, Before Income Taxes, Discounted At 10% As A Percentage Of Total Proved Reserves) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reserve Quantities [Line Items]
Total proved reserves year-end reserve report	$ 47,856	$ 53,911	$ 69,763
Proved developed producing reserves (PDP)	34,440	42,626	46,621
% of PDP reserves to total proved reserves	72.00%	79.00%	67.00%
Proved developed non-producing reserves	4,868	3,234	3,977
% of PDNP reserves to total proved reserves	10.00%	6.00%	6.00%
Proved undeveloped reserves (PUD)	8,548	8,051	19,165
% of PUD reserves to total proved reserves	18.00%	15.00%	27.00%
Oil [Member]
Reserve Quantities [Line Items]
Total proved reserves year-end reserve report		53,906	69,748
Proved developed producing reserves (PDP)		42,621	46,606
% of PDP reserves to total proved reserves		79.00%	67.00%
Proved developed non-producing reserves		3,234	3,977
% of PDNP reserves to total proved reserves		6.00%	6.00%
Proved undeveloped reserves (PUD)		8,051	19,165
% of PUD reserves to total proved reserves		15.00%	27.00%
Gas [Member]
Reserve Quantities [Line Items]
Total proved reserves year-end reserve report		5	15
Proved developed producing reserves (PDP)		5	15
% of PDP reserves to total proved reserves
Proved developed non-producing reserves
% of PDNP reserves to total proved reserves
Proved undeveloped reserves (PUD)
% of PUD reserves to total proved reserves