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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Current |  |  |
Federal | $ 56,544,000 | $ 24,618,000 | $ 39,749,000
State | 10,841,000 | 563,000 | (1,714,000)
Total | 67,385,000 | 25,181,000 | 38,035,000
Deferred |  |  |
Federal | 111,147,000 | 57,704,000 | 46,599,000
State | 27,233,000 | 23,225,000 | 28,145,000
Total | 138,380,000 | 80,929,000 | 74,744,000
Total income tax expense | 205,765,000 | 106,110,000 | 112,779,000
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 | 169,938,000 | 83,244,000 | 82,316,000
State income tax, net of federal income tax benefit | 17,513,000 | 9,609,000 | 8,989,000
Deferred tax adjustment related to change in overall state tax rate | 15,220,000 | 13,596,000 | 19,068,000
Other, net | 3,094,000 | (339,000) | 2,406,000
Total income tax expense | 205,765,000 | 106,110,000 | 112,779,000
Deferred Tax Assets |  |  |
Net operating loss carryforward | 78,182,000 | 137,422,000 |
Alternative minimum tax carryforward | 182,212,000 | 125,862,000 |
Foreign tax credits | 4,822,000 | 4,923,000 |
Derivatives and hedging | 3,946,000 |  |
Incentive compensation | 36,450,000 | 30,985,000 |
Deferred compensation | 11,988,000 | 8,485,000 |
Post-retirement benefits | 13,965,000 | 16,498,000 |
Other | 3,619,000 | 7,078,000 |
Total | 335,184,000 | 331,253,000 |
Deferred Tax Liabilities |  |  |
Properties and equipment | 1,321,241,000 | 1,199,213,000 |
Derivatives and hedging |  | 19,915,000 |
Total | 1,321,241,000 | 1,219,128,000 |
Net deferred tax liabilities | 986,057,000 | 887,875,000 |
State tax effected net operating losses |  |  |
Tax benefits related to employee stock-based compensation included in net operating loss carryforwards | 66,400,000 |  |
Reconciliation of unrecognized tax benefits |  |  |
Additions based on tax provisions related to the current year | 3,700,000 |  |
Unrecognized tax benefit balance at the end of the period | 3,700,000 |  |
Recognized tax benefits that would not affect the effective tax rate | 2,400,000 |  |
State Tax Reporting |  |  |
State tax effected net operating losses |  |  |
Net operating loss carryforwards | 378,600,000 |  |
Federal |  |  |
State tax effected net operating losses |  |  |
Net operating loss carryforwards | $ 221,100,000 |  |

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