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Note 3. Income Taxes | 9 Months Ended
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Sep. 30, 2012
Income Tax Disclosure [Text Block] | Note 3. Income Taxes Major components of our income tax provision (benefit) for the three and nine months ended September 30, 2012 and 2011 are as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 5,102 |  |  | $ | 3,854 |  |  | $ | 8,630 |  |  | $ | 7,965 |
State |  |  | 425 |  |  |  | 886 |  |  |  | 978 |  |  |  | 1,364 |
Foreign |  |  | 114 |  |  |  | 115 |  |  |  | 344 |  |  |  | 344 |
Total current income tax provision |  |  | 5,641 |  |  |  | 4,855 |  |  |  | 9,952 |  |  |  | 9,673 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal and state deferred income tax provision (benefit) |  |  | (5,627 | ) |  |  | 22,470 |  |  |  | (1,930 | ) |  |  | 60,790 |
Total income tax provision |  | $ | 14 |  |  | $ | 27,325 |  |  | $ | 8,022 |  |  | $ | 70,463 |
Our ability to utilize our deferred tax assets depends on future taxable income generated from operations. For the nine months ended September 30, 2012, there were no circumstances that caused us to change our assessment of the ability to generate future taxable income to realize our deferred tax assets. After a deferred benefit of $1.9 million during the first nine months of 2012, the net deferred tax asset at September 30, 2012 was $117.8 million. The deferred benefit realized through September 30, 2012 is primarily the result of temporary differences related to exploration expenses and unrealized losses on derivative contracts. It is possible that the valuation allowance on our deferred tax asset will change in the future as a result of the analysis of our long-range forecasts, with a resulting tax provision or benefit. The current income tax provisions for the nine months ended September 30, 2012 and 2011 vary from the amounts that would have resulted from applying the statutory income tax rate to pre-tax income primarily due to the effects of percentage depletion for all periods presented and the change in valuation allowance related to foreign operations during the nine months ended September 30, 2012.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 136, 172 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 44, 45, 46, 47, 48, 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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