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Balance Sheet Parenthetical (Parentheticals) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
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Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization | $ 2,418,939,000 | $ 2,376,170,000
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01
Common Stock, Shares Authorized | 200,000,000 | 200,000,000
Common Stock, Shares, Issued | 66,994,516 | 66,245,816
Common Stock, Shares, Outstanding | 66,972,104 | 66,195,235
Treasury Stock, Shares | 22,412 | 50,581
Assets Held-for-sale [Member] |  |
Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization | 539,769,000 | 20,676,000
Other Capitalized Property Plant and Equipment [Member] |  |
Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization | $ 27,571,000 | $ 22,442,000
6.625% Senior Notes Due 2019 [Member] |  |
Interest rate on notes (as a percent) | 6.625% | 6.625%
6.50% Senior Notes Due 2021 [Member] |  |
Interest rate on notes (as a percent) | 6.50% | 6.50%
6.50% Senior Notes Due 2023 [Member] |  |
Interest rate on notes (as a percent) | 6.50% | 6.50%
5.0% Senior Notes Due 2024 [Member] |  |
Interest rate on notes (as a percent) | 5.00% | 5.00%

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