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Income Taxes | 12 Months Ended
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Dec. 31, 2022
Income Tax Disclosure [Abstract] |
Income Taxes | 14. Income Taxes Income before income taxes for the United States for the year ended December 31, 2022 was $166 million. Loss before income taxes for the United States for the years ended December 31, 2021 and 2020 was $721 million and $917 million, respectively. Income before income taxes for non-U.S. jurisdictions for the years ended December 31, 2022 and 2021 was $2 million and $0.9 million, respectively. Loss before income taxes for non-U.S. jurisdictions for years ended December 31, 2020 was $14.2 million. Components of the income tax provision applicable to federal, state and foreign income taxes for the years ended December 31, 2022, 2021 and 2020 are as follows (in thousands):
|  | 2022 |  |  | 2021 |  |  | 2020 |
Federal income tax expense (benefit): |  |  |  |  |  |  |  |  |
Current |  | $ | 480 |  |  | $ | — |  |  | $ | (1,977 | )
Deferred |  |  | 11,820 |  |  |  | (86,878 | ) |  |  | (107,334 | )
|  |  | 12,300 |  |  |  | (86,878 | ) |  |  | (109,311 | )
State income tax expense (benefit): |  |  |  |  |  |  |  |  |
Current |  |  | 2,647 |  |  |  | 144 |  |  |  | 225 |
Deferred |  |  | (4,896 | ) |  |  | 23,028 |  |  |  | (17,949 | )
|  |  | (2,249 | ) |  |  | 23,172 |  |  |  | (17,724 | )
Foreign income tax expense (benefit): |  |  |  |  |  |  |  |  |
Current |  |  | 2,750 |  |  |  | 134 |  |  |  | (291 | )
Deferred |  |  | 403 |  |  |  | 870 |  |  | — |
|  |  | 3,153 |  |  |  | 1,004 |  |  |  | (291 | )
Total income tax expense (benefit): |  |  |  |  |  |  |  |  |
Current |  |  | 5,877 |  |  |  | 278 |  |  |  | (2,043 | )
Deferred |  |  | 7,327 |  |  |  | (62,980 | ) |  |  | (125,283 | )
Total income tax expense (benefit) |  | $ | 13,204 |  |  | $ | (62,702 | ) |  | $ | (127,326 | )
The difference between the statutory U.S. federal income tax rate and the effective income tax rate for the years ended December 31, 2022, 2021 and 2020 is summarized as follows:
|  | 2022 |  |  | 2021 |  |  | 2020 |
Statutory tax rate |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | %
State income taxes - net of the federal income tax benefit |  |  | 3.0 |  |  |  | 3.0 |  |  |  | 1.7 |
State deferred tax remeasurement |  |  | 9.4 |  |  |  | (0.8 | ) |  |  | — |
Goodwill impairment |  |  | — |  |  |  | — |  |  |  | (8.2 | )
Valuation allowance |  |  | (33.4 | ) |  |  | (13.3 | ) |  |  | (0.2 | )
U.S. impact of foreign operations |  |  | 1.3 |  |  |  | — |  |  |  | — |
Effect of foreign taxes |  |  | 1.6 |  |  |  | (0.1 | ) |  |  | (0.1 | )
Non-deductible compensation |  |  | 4.3 |  |  |  | (0.3 | ) |  |  | — |
Share-based compensation |  |  | (1.9 | ) |  |  | (0.3 | ) |  |  | (0.5 | )
Non-deductible expenses |  |  | 1.2 |  |  |  | (0.2 | ) |  |  | (0.1 | )
Other differences, net |  |  | 1.4 |  |  |  | (0.3 | ) |  |  | 0.1 |
Effective tax rate |  |  | 7.9 | % |  |  | 8.7 | % |  |  | 13.7 | %
Our effective income tax rate fluctuates based on, among other factors, changes in pre-tax income in countries with varying statutory tax rates, changes in valuation allowances, and the impacts of various other permanent adjustments. The ability to recognize a portion of our U.S. federal and state net operating losses resulted in a significant impact, through changes in valuation allowances, in our effective tax rate for the year ended December 31, 2022. This benefit was partly offset by state and local income taxes and various other permanent adjustments. The tax effect of temporary differences and tax attributes representing deferred tax assets and liabilities at December 31, 2022 and 2021 are as follows (in thousands):
|  | 2022 |  |  | 2021 |
Deferred tax assets: |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 382,936 |  |  | $ | 457,362 |
Tax credits |  |  | 4,222 |  |  |  | 4,453 |
Expense associated with stock options and restricted stock |  |  | 8,178 |  |  |  | 9,364 |
Workers’ compensation allowance |  |  | 15,770 |  |  |  | 14,833 |
Other deferred tax asset |  |  | 25,020 |  |  |  | 26,483 |
|  |  | 436,126 |  |  |  | 512,495 |
Less: |  |  |  |  |  |
Allowance to reduce deferred tax asset to expected realizable value |  |  | (91,685 | ) |  |  | (189,737 | )
Total deferred tax assets |  |  | 344,441 |  |  |  | 322,758 |
Deferred tax liabilities: |  |  |  |  |  |
Property and equipment basis difference |  |  | (355,129 | ) |  |  | (335,980 | )
Other |  |  | (14,840 | ) |  |  | (12,037 | )
Total deferred tax liabilities |  |  | (369,969 | ) |  |  | (348,017 | )
Net deferred tax liability |  | $ | (25,528 | ) |  | $ | (25,259 | )
In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized, and when necessary, valuation allowances are provided. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. We assess the realizability of our deferred tax assets quarterly and consider carryback availability, the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. During 2022, we reduced the valuation allowance against our net deferred tax assets by $98.1 million, which primarily related to U.S. federal and state activity. For income tax purposes, we have approximately $1.4 billion of gross U.S. federal net operating losses, approximately $48.3 million of gross Canadian net operating losses, approximately $18.8 million of gross Colombian net operating losses and approximately $1.0 billion of post-apportionment U.S. state net operating losses as of December 31, 2022, before valuation allowances. The majority of U.S. federal net operating losses will expire in varying amounts, if unused, between 2030 and 2037. U.S. federal net operating losses generated after 2017 can be carried forward indefinitely. Canadian net operating losses will expire in varying amounts, if unused, between 2037 and 2042. Colombian net operating losses will expire in varying amounts, if unused, between 2028 and 2032. U.S. state net operating losses will expire in varying amounts, if unused, between 2023 and 2042. As of December 31, 2022, we had no unrecognized tax benefits. We have established a policy to account for interest and penalties related to uncertain income tax positions as operating expenses. As of December 31, 2022, the tax years ended December 31, 2014 through December 31, 2021 are open for examination by U.S. taxing authorities. As of December 31, 2022, the tax years ended December 31, 2015 through December 31, 2021 are open for examination by Canadian taxing authorities. As of December 31, 2022, the tax years ended December 31, 2017 through December 31, 2021 are open for examination by Colombian taxing authorities. We continue to monitor income tax developments in the United States and other countries where we have legal entities. We will incorporate into our future financial statements the impacts, if any, of future regulations and additional authoritative guidance when finalized. We continue to elect permanent reinvestment of unremitted earnings in foreign jurisdictions and we intend to do so for the foreseeable future. If we were to repatriate earnings, in the form of dividends or otherwise, we may be subject to certain income and/or withholding taxes (subject to an adjustment for foreign tax credits).

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