Oil And Gas Properties (Capitalized Exploratory Project Costs) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Capitalized Exploratory Well Costs	$ 8,247		$ 5,840		$ 3,252	$ 3,059
T-6 [Member]
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Capitalized Exploratory Well Costs	8,122	[1]
Wang [Member]
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Capitalized Exploratory Well Costs			3,096	[1]
Danny 2 [Member]
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Capitalized Exploratory Well Costs			2,619
Other [Member]
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Capitalized Exploratory Well Costs	$ 125		$ 125

[1] Both of these wells are located within the Phoenix field at Green Canyon Block 237.