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Income Taxes - Summary of Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amount |  |  |
Computed expected federal income tax | $ (79,952) | $ (230,860) | $ (65,546)
State income tax, net of federal income tax benefit | (4,239) | (10,888) | (3,152)
Deferred tax adjustment related to change in overall state tax rate | (48) | (663) | 2,822
Valuation allowance | (505) | 221 | 187
Provision to return adjustments | (3,242) | (121) | (6,326)
Excess stock compensation | 2,965 | 0 | 0
Tax Act | (242,875) | 0 | 0
Other, net | (932) | (164) | (1,367)
Income tax (benefit) expense | $ (328,828) | $ (242,475) | $ (73,382)
Rate |  |  |
Statutory federal income tax rate (as a percent) | 35.00% | 35.00% | 35.00%
State income tax, net of federal income tax benefit (as a percent) | 1.86% | 1.65% | 1.68%
Deferred tax adjustment related to change in overall state tax rate (as a percent) | 0.02% | 0.10% | (1.51%)
Valuation allowance (as a percent) | 0.22% | (0.03%) | (0.10%)
Provision to return adjustments (as a percent) | 1.42% | 0.02% | 3.38%
Excess stock compensation (as a percent) | (1.30%) | (0.00%) | (0.00%)
Tax reform (as a percent) | 106.32% | 0.00% | 0.00%
Other, net (as a percent) | 0.41% | 0.02% | 0.73%
Income tax benefit (as a percent) | 143.95% | 36.76% | 39.18%

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- Definition The portion of the difference, between total income tax expense or benefit as reported in the income statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to deferred tax adjustment related to change in overall state tax rate. + References No definition available. + Details
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