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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) | The provision (benefit) for income taxes is composed of the following:
| Year ended December 31,
(in thousands) | 2023 |  | 2022 |  | 2021
Current: |  |  |  |  |
Federal | $ | — |  |  | $ | 6 |  |  | $ | (494) |
State | 3,306 |  |  | 73 |  |  | 552 |
Foreign | 204 |  |  | 209 |  |  | (6) |
Total current | 3,510 |  |  | 288 |  |  | 52 |
Deferred: |  |  |  |  |
Federal | 36,910 |  |  | 1,189 |  |  | 40,693 |
State | 1,035 |  |  | 983 |  |  | 4,022 |
Total deferred | 37,945 |  |  | 2,172 |  |  | 44,715 |
Total income tax provision | $ | 41,455 |  |  | $ | 2,460 |  |  | $ | 44,767 |
Schedule of Effective Income Tax Rate Reconciliation | The effective tax rate on income before income taxes differed from the federal statutory income tax rate as follows:
| Year ended December 31,
(in thousands) | 2023 |  | 2022 |  | 2021
Income tax expense at federal statutory rate | $ | 33,401 |  |  | $ | 1,040 |  |  | $ | 41,575 |
State income taxes, net of federal income tax benefit | 3,503 |  |  | 1,189 |  |  | 4,257 |
Foreign income tax expense | 204 |  |  | 210 |  |  | (6) |
Executive compensation | 3,692 |  |  | 57 |  |  | 2,359 |
Federal tax credits | (2,034) |  |  | (1,103) |  |  | (385) |
Stock compensation | 1,936 |  |  | 1,016 |  |  | (2,058) |
Other | 753 |  |  | 51 |  |  | (975) |
Total income tax expense | $ | 41,455 |  |  | $ | 2,460 |  |  | $ | 44,767 |
Schedule of Deferred Tax Assets and Liabilities | The major components of the Company’s net deferred tax assets and liabilities are as follows:
| As of December 31,
(in thousands) | 2023 |  | 2022
Deferred tax assets: |  |  |
Employee benefits | $ | 8,410 |  |  | $ | 9,938 |
Net operating loss | 22,237 |  |  | 30,370 |
Tax credits | 4,128 |  |  | 4,290 |
Other(1) | 30,576 |  |  | 18,644 |
Less: valuation allowance | 1,214 |  |  | 1,214 |
Total deferred tax assets | 64,137 |  |  | 62,028 |
Deferred tax liabilities: |  |  |
Prepaid expenses | 4,516 |  |  | 4,223 |
Depreciation | 434,620 |  |  | 399,622 |
Other | 9,603 |  |  | 4,571 |
Total deferred tax liabilities | 448,739 |  |  | 408,416 |
Net deferred tax liabilities | $ | 384,602 |  |  | $ | 346,388 |
(1)Other deferred tax assets consists of interest expense and research and development expenses.

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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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 9 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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