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Supplemental Oil and Gas Disclosures (Unaudited) (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in Discounted Future Net Cash Flows Detail [Table]      
Standardized measure, beginning of year $ 0 $ 6,475 $ 133,269
Sales, net of production costs 0 (2,409) (48,445)
Net change in prices, net of production costs 0 0 (11,916)
Changes in future development and abandonment costs 0 0 43,792
Development and abandonment costs incurred 0 0 25,083
Accretion of discount 0 0 17,909
Net change in income taxes 0 0 44,612
Purchases of reserves in place 0 0 0
Extensions and discoveries 0 0 0
Sales of reserves in place 0 (7,918) (198,324)
Net change due to revision in quantity estimates 0 0 (10,814)
Changes in production rates (timing) and other 0 3,852 11,309
Subtotal 0 (6,475) (126,794)
Standardized measure, end of year $ 0 $ 0 $ 6,475