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INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Provision for doubtful accounts | $ 10,305 | $ 8,949
Closure, post-closure and remedial liabilities | 28,665 | 26,960
Operating lease liabilities | 38,151 | 40,879
Accrued expenses | 16,797 | 17,602
Accrued compensation and benefits | 11,372 | 7,155
Net operating loss carryforwards | 50,433 | 50,824
Tax credit carryforwards | 14,471 | 16,909
Interest rate swap liability | 10,089 | 6,252
Stock-based compensation | 3,040 | 2,435
Other | 5,553 | 8,342
Total deferred tax assets | 188,876 | 186,307
Deferred tax liabilities: |  |
Property, plant and equipment | (194,604) | (184,594)
Operating lease right-of-use assets | (38,018) | (40,985)
Permits and other intangible assets | (95,492) | (98,654)
Prepaid expenses | (9,660) | (9,694)
Total deferred tax liabilities | (337,774) | (333,927)
Total net deferred tax liability before valuation allowance | (148,898) | (147,620)
Less valuation allowance | (77,044) | (83,643)
Net deferred tax liabilities | (225,942) | $ (231,263)
State and local operating loss carryforwards | 193,200 |
Federal operating loss carryforwards | 16,800 |
Foreign operating loss carryforwards | 151,500 |
Foreign tax credit carryforwards | $ 14,100 |

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