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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Components of Income Tax Provision | Components of the income tax provision applicable to federal, state and foreign income taxes for the years ended December 31, 2018, 2017 and 2016 are as follows (in thousands):
|  | 2018 |  |  | 2017 |  |  | 2016 |
Federal income tax benefit: |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | (3,954 | ) |  | $ | (42 | ) |  | $ | (24,777 | )
Deferred |  |  | (35,081 | ) |  |  | (335,106 | ) |  |  | (134,592 | )
|  |  | (39,035 | ) |  |  | (335,148 | ) |  |  | (159,369 | )
State income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 1,704 |  |  |  | (215 | ) |  |  | (257 | )
Deferred |  |  | (11,147 | ) |  |  | 4,511 |  |  |  | (14,163 | )
|  |  | (9,443 | ) |  |  | 4,296 |  |  |  | (14,420 | )
Foreign income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | (2,552 | ) |  |  | (3,108 | ) |  |  | (368 | )
Deferred |  |  | 5,043 |  |  |  | 249 |  |  |  | (3,405 | )
|  |  | 2,491 |  |  |  | (2,859 | ) |  |  | (3,773 | )
Total income tax benefit: |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | (4,802 | ) |  |  | (3,365 | ) |  |  | (25,402 | )
Deferred |  |  | (41,185 | ) |  |  | (330,346 | ) |  |  | (152,160 | )
Total income tax benefit: |  | $ | (45,987 | ) |  | $ | (333,711 | ) |  | $ | (177,562 | )
Difference Between Statutory Federal Income Tax Rate and Effective Income Tax Rate | The difference between the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2018, 2017 and 2016 is summarized as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Statutory tax rate |  |  | 21.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State income taxes - net of the federal income tax benefit |  |  | 1.2 |  |  |  | 1.9 |  |  |  | 2.0 |
Goodwill impairment |  |  | (6.9 | ) |  |  | — |  |  |  | — |
Permanent differences |  |  | (0.6 | ) |  |  | (1.3 | ) |  |  | (0.1 | )
Tax effects of tax reform |  |  | (1.3 | ) |  |  | 66.7 |  |  |  | — |
Share-based payments |  |  | (0.1 | ) |  |  | 3.6 |  |  |  | — |
Acquisition related differences |  |  | — |  |  |  | (3.3 | ) |  |  | — |
Valuation allowance |  |  | (3.7 | ) |  |  | — |  |  |  | — |
State deferred tax remeasurement |  |  | 2.3 |  |  |  | — |  |  |  | — |
Other differences, net |  |  | 0.6 |  |  |  | (0.8 | ) |  |  | (1.1 | )
Effective tax rate |  |  | 12.5 | % |  |  | 101.8 | % |  |  | 35.8 | %
Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities | The tax effect of significant temporary differences representing deferred tax assets and liabilities at December 31, 2018 and 2017 are as follows (in thousands):
|  | 2018 |  |  | 2017 |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 324,389 |  |  | $ | 275,402 |
Tax credits |  |  | 6,404 |  |  |  | 9,053 |
Expense associated with stock options and restricted stock |  |  | 13,375 |  |  |  | 12,126 |
Workers' compensation allowance |  |  | 19,900 |  |  |  | 19,323 |
Other |  |  | 22,423 |  |  |  | 25,891 |
|  |  | 386,491 |  |  |  | 341,795 |
Allowance to reduce deferred tax asset to expected realizable value |  |  | (13,232 | ) |  |  | — |
Total deferred tax assets |  |  | 373,259 |  |  |  | 341,795 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Property and equipment basis difference |  |  | (669,196 | ) |  |  | (678,093 | )
Other |  |  | (10,224 | ) |  |  | (10,663 | )
Total deferred tax liabilities |  |  | (679,420 | ) |  |  | (688,756 | )
Net deferred tax liability |  | $ | (306,161 | ) |  | $ | (346,961 | )

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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