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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Current |  |  |
Federal | $ 24,618,000 | $ 39,749,000 | $ 29,879,000
State | 563,000 | (1,714,000) | 3,424,000
Total | 25,181,000 | 38,035,000 | 33,303,000
Deferred |  |  |
Federal | 57,704,000 | 46,599,000 | 37,981,000
State | 23,225,000 | 28,145,000 | 23,828,000
Total | 80,929,000 | 74,744,000 | 61,809,000
Total income tax expense | 106,110,000 | 112,779,000 | 95,112,000
Reconciliation of actual provision for income taxes and provision for income taxes resulting from the use of federal statutory income tax |  |  |
Statutory federal income tax rate (as a percent) | 35.00% | 35.00% | 35.00%
Computed "expected" federal income tax | 83,244,000 | 82,316,000 | 69,475,000
State income tax, net of federal income tax benefit | 9,609,000 | 8,989,000 | 6,638,000
Deferred tax adjustment related to change in overall state tax rate | 13,596,000 | 19,068,000 | 18,973,000
Other, net | (339,000) | 2,406,000 | 26,000
Total income tax expense | 106,110,000 | 112,779,000 | 95,112,000
Deferred Tax Liabilities |  |  |
Property, plant and equipment | 1,204,735,000 | 1,068,762,000 |
Hedging liabilities / receivables | 19,915,000 | 68,670,000 |
Prepaid expenses and other | 736,000 | 9,261,000 |
Total | 1,225,386,000 | 1,146,693,000 |
Deferred Tax Assets |  |  |
Alternative minimum tax credit | 125,862,000 | 101,290,000 |
Net operating loss | 137,422,000 | 113,496,000 |
Foreign tax credits | 4,923,000 | 4,685,000 |
Pension and other post-retirement benefits | 16,498,000 | 19,892,000 |
Items accrued for financial reporting purposes and other | 52,806,000 | 49,606,000 |
Total | 337,511,000 | 288,969,000 |
Net deferred tax liabilities | 887,875,000 | 857,724,000 |
Reconciliation of the beginning and ending amount of unrecognized tax benefits |  |  |
Unrecognized tax benefit balance at the beginning of the period |  |  | 500,000
Reductions for tax positions of prior years |  |  | (500,000)
State tax effected net operating losses |  |  |
Tax benefits related to employee stock-based compensation included in net operating loss carryforwards | 66,900,000 |  |
State Tax Reporting |  |  |
State tax effected net operating losses |  |  |
Net operating loss carryforwards | 378,200,000 |  |
Federal |  |  |
State tax effected net operating losses |  |  |
Net operating loss carryforwards | $ 398,600,000 |  |

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- Definition The cumulative amount of the estimated future tax effects attributable to prepaid expenses and other temporary differences not otherwise specified in this taxonomy that were expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, or which were recognized as revenue under GAAP but not for tax purposes, which will reverse in future periods. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 289 -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 -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Paragraph Question 1-7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -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 7: 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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 + Details
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