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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019, 2018 and 2017 are as follows (in thousands):
|  | 2019 |  |  | 2018 |  |  | 2017 |
Federal income tax benefit: |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | (1,976 | ) |  | $ | (3,954 | ) |  | $ | (42 | )
Deferred |  |  | (90,441 | ) |  |  | (35,081 | ) |  |  | (335,106 | )
|  |  | (92,417 | ) |  |  | (39,035 | ) |  |  | (335,148 | )
State income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 851 |  |  |  | 1,704 |  |  |  | (215 | )
Deferred |  |  | (11,593 | ) |  |  | (11,147 | ) |  |  | 4,511 |
|  |  | (10,742 | ) |  |  | (9,443 | ) |  |  | 4,296 |
Foreign income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | (348 | ) |  |  | (2,552 | ) |  |  | (3,108 | )
Deferred |  |  | (1,168 | ) |  |  | 5,043 |  |  |  | 249 |
|  |  | (1,516 | ) |  |  | 2,491 |  |  |  | (2,859 | )
Total income tax benefit: |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | (1,473 | ) |  |  | (4,802 | ) |  |  | (3,365 | )
Deferred |  |  | (103,202 | ) |  |  | (41,185 | ) |  |  | (330,346 | )
Total income tax benefit: |  | $ | (104,675 | ) |  | $ | (45,987 | ) |  | $ | (333,711 | )
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, 2019, 2018 and 2017 is summarized as follows:
|  | 2019 |  |  | 2018 |  |  | 2017 |
Statutory tax rate |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 35.0 | %
State income taxes - net of the federal income tax benefit |  |  | 1.7 |  |  |  | 1.2 |  |  |  | 1.9 |
Goodwill impairment |  |  | (0.7 | ) |  |  | (6.9 | ) |  |  | — |
Permanent differences |  |  | (0.5 | ) |  |  | (0.6 | ) |  |  | (1.3 | )
Tax effects of tax reform |  |  | — |  |  |  | (1.3 | ) |  |  | 66.7 |
Share-based payments |  |  | (0.7 | ) |  |  | (0.1 | ) |  |  | 3.6 |
Acquisition related differences |  |  | — |  |  |  | — |  |  |  | (3.3 | )
Valuation allowance |  |  | (0.8 | ) |  |  | (3.7 | ) |  |  | — |
State deferred tax remeasurement |  |  | (1.1 | ) |  |  | 2.3 |  |  |  | — |
Other differences, net |  |  | 0.8 |  |  |  | 0.6 |  |  |  | (0.8 | )
Effective tax rate |  |  | 19.7 | % |  |  | 12.5 | % |  |  | 101.8 | %
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, 2019 and 2018 are as follows (in thousands):
|  | 2019 |  |  | 2018 |
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 375,308 |  |  | $ | 324,389 |
Tax credits |  |  | 4,138 |  |  |  | 6,404 |
Expense associated with stock options and restricted stock |  |  | 10,561 |  |  |  | 13,375 |
Workers' compensation allowance |  |  | 19,536 |  |  |  | 19,900 |
Other deferred tax asset |  |  | 21,698 |  |  |  | 22,423 |
|  |  | 431,241 |  |  |  | 386,491 |
Less: |  |  |  |  |  |  |  |
Valuation allowance |  |  | (17,231 | ) |  |  | (13,232 | )
Total deferred tax assets |  |  | 414,010 |  |  |  | 373,259 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Property and equipment basis difference |  |  | (607,785 | ) |  |  | (669,196 | )
Other |  |  | (9,184 | ) |  |  | (10,224 | )
Total deferred tax liabilities |  |  | (616,969 | ) |  |  | (679,420 | )
Net deferred tax liability |  | $ | (202,959 | ) |  | $ | (306,161 | )

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