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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 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 | 41,585 | 68,381
Tax credit carryforwards | 8,903 | 12,368
Interest rate swap liability | 0 | 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) | 0
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)
State net operating loss carryforwards, begin to expire in 2023 | 231,400 |
Federal operating loss carryforwards, begin to expire in 2024 | 34,800 |
Foreign net operating loss carryforwards, begin to expire in 2023 | 85,600 |
Foreign tax credit carryforwards, begin to expire between 2023 and 2024 | $ 7,700 |

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