Annual report pursuant to Section 13 and 15(d)

Supplemental Information on Oil and Gas Producing Activities (Unaudited) (Details 1)

v2.4.0.6
Supplemental Information on Oil and Gas Producing Activities (Unaudited) (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Capitalized Costs Relating to Oil and Gas Producing Activities:      
Properties not being amortized $ 188,208 $ 178,653 $ 25,504
Properties being amortized(1) 195,329 182,820 170,457
Total capitalized costs 262,123 228,867 195,961
Less accumulated depreciation, depletion, and amortization (155,681) (129,166) (99,277)
Net capitalized costs $ 106,442 $ 99,701 $ 96,684