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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2022
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | The domestic and foreign components of income before provision for income taxes were as follows (in thousands):
| For the years ended December 31,
| 2022 |  | 2021 |  | 2020
Domestic | $ | 406,206 |  |  | $ | 223,438 |  |  | $ | 168,117 |
Foreign | 131,792 |  |  | 46,277 |  |  | 6,433 |
Total | $ | 537,998 |  |  | $ | 269,715 |  |  | $ | 174,550 |
Schedule of Components of Provision for Income Taxes | The provision for income taxes consisted of the following (in thousands, except percentages):
| For the years ended December 31,
| 2022 |  | 2021 |  | 2020
Current: |  |  |  |  |
Federal | $ | 52,237 |  |  | $ | 42,480 |  |  | $ | 33,327 |
State | 26,980 |  |  | 18,126 |  |  | 14,575 |
Foreign | 29,488 |  |  | 4,380 |  |  | 1,559 |
| 108,705 |  |  | 64,986 |  |  | 49,461 |
Deferred |  |  |  |  |
Federal | 32,199 |  |  | 2,275 |  |  | (965) |
State | (2,432) |  |  | (4,777) |  |  | (2,506) |
Foreign | (12,218) |  |  | 3,984 |  |  | (6,277) |
| 17,549 |  |  | 1,482 |  |  | (9,748) |
Provision for income taxes | $ | 126,254 |  |  | $ | 66,468 |  |  | $ | 39,713 |
Effective tax rate | 23.5% |  | 24.6% |  | 22.8%
Schedule of Effective Income Tax Rate Reconciliation | The Company's effective income tax rate varied from the amount computed using the statutory federal income tax rate of 21% as follows (in thousands):
| For the years ended December 31,
| 2022 |  | 2021 |  | 2020
Tax expense at U.S. statutory rate | $ | 112,980 |  |  | $ | 56,640 |  |  | $ | 36,655 |
State income taxes, net of federal benefit | 19,831 |  |  | 12,101 |  |  | 9,837 |
Foreign rate differential | 6,196 |  |  | 1,922 |  |  | 1,256 |
Valuation allowance | (18,769) |  |  | (9,139) |  |  | (11,339) |
Uncertain tax position interest and penalties | (2,454) |  |  | 263 |  |  | (712) |
Tax credits expired | 2,768 |  |  | 2,530 |  |  | 2,039 |
Non-deductible compensation | 2,754 |  |  | 2,326 |  |  | 1,406 |
Other | 2,948 |  |  | (175) |  |  | 571 |
Provision for income taxes | $ | 126,254 |  |  | $ | 66,468 |  |  | $ | 39,713 |
Schedule of Deferred Tax Assets and Liabilities | The components of the total net deferred tax assets and liabilities as of December 31, 2022 and 2021 were as follows (in thousands):
| 2022 |  | 2021
Deferred tax assets: |  |  |
Provision for doubtful accounts | $ | 11,544 |  |  | $ | 10,188 |
Closure, post-closure and remedial liabilities | 31,837 |  |  | 28,206 |
Operating lease liabilities | 42,255 |  |  | 42,218 |
Accrued expenses | 19,311 |  |  | 20,455 |
Accrued compensation and benefits | 20,171 |  |  | 24,504 |
Net operating loss carryforwards(1) | 41,585 |  |  | 68,381 |
Tax credit carryforwards(2) | 8,903 |  |  | 12,368 |
Interest rate swap liability | — |  |  | 5,215 |
Stock-based compensation | 3,988 |  |  | 2,705 |
Other | 7,487 |  |  | 5,635 |
Total deferred tax assets | 187,081 |  |  | 219,875 |
Deferred tax liabilities: |  |  |
Property, plant and equipment | (281,131) |  |  | (273,883) |
Operating lease right-of-use assets | (41,939) |  |  | (41,260) |
Interest rate swap asset | (17,587) |  |  | — |
Permits and other intangible assets | (132,681) |  |  | (138,241) |
Prepaid expenses | (12,088) |  |  | (10,212) |
Total deferred tax liabilities | (485,426) |  |  | (463,596) |
Total net deferred tax liability before valuation allowance | (298,345) |  |  | (243,721) |
Less valuation allowance | (42,509) |  |  | (69,806) |
Net deferred tax liabilities | $ | (340,854) |  |  | $ | (313,527) |
___________________________________ (1)As of December 31, 2022, the net operating loss carryforwards included (i) state net operating loss carryforwards of $231.4 million which will begin to expire in 2023, (ii) federal net operating loss carryforwards of $34.8 million which will begin to expire in 2024 and (iii) foreign net operating loss carryforwards of $85.6 million which will begin to expire in 2023. (2)As of December 31, 2022, the foreign tax credit carryforwards of $7.7 million will expire between 2023 and 2024.
Schedule of Valuation Allowance | The components of the total valuation allowance as of December 31, 2022 and 2021 were as follows (in thousands):
| 2022 |  | 2021
Allowance related to: |  |  |
Foreign tax credits | 7,666 |  |  | 11,047 |
Federal net operating losses | 3,783 |  |  | 3,788 |
State net operating loss carryforwards | 9,928 |  |  | 12,053 |
Foreign net operating loss carryforwards | 15,488 |  |  | 26,697 |
Deferred tax assets of a Canadian subsidiary | 5,339 |  |  | 10,701 |
Realized and unrealized capital losses | 305 |  |  | 5,520 |
Total valuation allowance | $ | 42,509 |  |  | $ | 69,806 |

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