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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Provision for doubtful accounts | $ 10,188 | $ 10,305
Closure, post-closure and remedial liabilities | 28,206 | 28,665
Operating lease liabilities | 42,218 | 38,151
Accrued expenses | 20,455 | 16,797
Accrued compensation and benefits | 24,504 | 11,372
Net operating loss carryforwards | 68,381 | 50,433
Tax credit carryforwards | 12,368 | 14,471
Interest rate swap liability | 5,215 | 10,089
Stock-based compensation | 2,705 | 3,040
Other | 5,635 | 5,553
Total deferred tax assets | 219,875 | 188,876
Deferred tax liabilities: |  |
Property, plant and equipment | (273,883) | (194,604)
Operating lease right-of-use assets | (41,260) | (38,018)
Permits and other intangible assets | (138,241) | (95,492)
Prepaid expenses | (10,212) | (9,660)
Total deferred tax liabilities | (463,596) | (337,774)
Total net deferred tax liability before valuation allowance | (243,721) | (148,898)
Less valuation allowance | (69,806) | (77,044)
Net deferred tax liabilities | (313,527) | $ (225,942)
State net operating loss carryforwards, begin to expire in 2022 | 280,600 |
Federal operating loss carryforwards, begin to expire in 2024 | 124,100 |
Foreign net operating loss carryforwards, begin to expire in 2022 | 116,000 |
Foreign tax credit carryforwards, begin to expire between 2022 and 2024 | $ 11,000 |

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