Oil And Gas Properties (Capitalized Exploratory Project Costs) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2008
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Total	$ 5,840		$ 3,252		$ 3,059	$ 2,105
Wang [Member]
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Total	3,096	[1]	3,095	[1]
Danny 2 [Member]
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Total	2,619	[1]	32	[1]
Other [Member]
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]
Total	$ 125		$ 125

[1] Amounts primarily reflect pre-engineering costs. The Wang prospect is located in proximity of our Phoenix field that commenced production in October 2010. The Danny 2 (formerly Kathleen) prospect is located within our Bushwood field at Garden Banks Blocks 462, 463, 506 and 507. Both Wang and Danny 2 are budgeted exploration capital expenditures for 2012.