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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Reconciliation Between Statutory Federal Income Tax Rate and Effective Income Tax | Our income tax benefit was $338.7 million for the year ended December 31, 2015 compared to income tax expense of $396.5 million in 2014 and income tax expense of $33.9 million in 2013. Reconciliation between the statutory federal income tax rate and our effective income tax rate is as follows:
| Year Ended December 31, |
| 2015 |  | 2014 |  |  | 2013 |
Federal statutory tax rate | 35.0 | % |  | 35.0 | % |  |  | 35.0 | %
State | 4.3 |  |  | 3.1 |  |  |  | (2.3 | )
State apportionment rate change | (0.2 | ) |  | (0.2 | ) |  |  | (14.9 | )
Non-deductible executive compensation | (0.1 | ) |  | 0.2 |  |  |  | 0.7 |
Valuation allowances | (6.8 | ) |  | 0.2 |  |  |  | 3.5 |
Other | ¾ |  |  | 0.2 |  |  |  | 0.6 |
Consolidated effective tax rate | 32.2 | % |  | 38.5 | % |  |  | 22.6 | %
Income Tax (Benefit) Expense Attributable to Income Before Income Taxes | Income tax (benefit) expense attributable to income before income taxes consists of the following (in thousands):
|  |  | 2015 |  |  |  | 2014 |  |  |  | 2013 |
|  |  | Current |  |  | Deferred |  |  | Total |  |  | Current |  |  | Deferred |  |  | Total |  |  | Current |  |  | Deferred |  |  | Total |
U.S. federal |  | $ | ¾ |  |  | $ | (328,257 | ) |  | $ | (328,257 | ) |  | $ | ¾ |  |  | $ | 361,152 |  |  | $ | 361,152 |  |  | $ | ¾ |  |  | $ | 58,527 |  |  | $ | 58,527 |
U.S. state and local |  |  | 29 |  |  |  | (10,449 | ) |  |  | (10,420 | ) |  |  | 1 |  |  |  | 35,350 |  |  |  | 35,351 |  |  |  | (143 | ) |  |  | (24,527 | ) |  |  | (24,670 | )
Total |  | $ | 29 |  |  | $ | (338,706 | ) |  | $ | (338,677 | ) |  | $ | 1 |  |  | $ | 396,502 |  |  | $ | 396,503 |  |  | $ | (143 | ) |  | $ | 34,000 |  |  | $ | 33,857 |
Significant Components of Deferred Tax Assets and Liabilities | Significant components of deferred tax assets and liabilities are as follows:
| December 31, |
| 2015 |  |  | 2014 |
| (in thousands) |
Deferred tax assets: |  |  |  |  |  |  |
Net operating loss carryforward | $ | 173,503 |  |  | $ | 176,812 |
Deferred compensation |  | 45,413 |  |  |  | 73,942 |
Equity compensation |  | 25,940 |  |  |  | 25,833 |
AMT credits and other credits |  | 4,437 |  |  |  | 4,447 |
Asset retirement obligation |  | 101,142 |  |  |  | 109,808 |
Cumulative mark-to-market loss |  | ¾ |  |  |  | 649 |
Other |  | 10,163 |  |  |  | 10,908 |
Valuation allowances: |  |  |  |  |  |  |
Federal |  | (42,500 | ) |  |  | ¾ |
State, net of federal benefit |  | (41,516 | ) |  |  | (8,800 | )
Deferred compensation plans and other |  | (3,607 | ) |  |  | (7,799 | )
Total deferred tax assets |  | 272,975 |  |  |  | 385,800 |
Deferred tax liabilities: |  |  |  |  |  |  |
Depreciation, depletion and investments |  | (940,482 | ) |  |  | (1,342,038 | )
Cumulative mark-to-market gain |  | (109,845 | ) |  |  | (154,183 | )
Other |  | (595 | ) |  |  | (2,660 | )
Total deferred tax liabilities |  | (1,050,922 | ) |  |  | (1,498,881 | )
Net deferred tax liability | $ | (777,947 | ) |  | $ | (1,113,081 | )

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: 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 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: 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 + Details
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