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INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Provision for doubtful accounts | $ 8,949 | $ 10,715
Closure, post-closure and remedial liabilities | 26,960 | 28,380
Accrued expenses | 40,879 |
Accrued expenses | 17,602 | 15,686
Accrued compensation | 7,155 | 7,774
Net operating loss carryforwards | 50,824 | 43,284
Tax credit carryforwards | 16,909 | 16,909
Uncertain tax positions accrued interest and federal benefit | 4,176 | 519
Stock-based compensation | 2,435 | 3,440
Other | 10,418 | 7,067
Total deferred tax assets | 186,307 | 133,774
Deferred tax liabilities: |  |
Property, plant and equipment | (184,594) | (164,246)
Operating lease right-of-use assets | (40,985) |
Permits and other intangible assets | (98,654) | (103,539)
Prepaid expenses | (9,694) | (9,187)
Total deferred tax liabilities | (333,927) | (276,972)
Total net deferred tax liability before valuation allowance | (147,620) | (143,198)
Less valuation allowance | (83,643) | (79,295)
Net deferred tax liabilities | (231,263) | $ (222,493)
State and local operating loss carryforwards | 201,800 |
Federal operating loss carryforwards | 25,500 |
Foreign operating loss carryforwards | 145,000 |
Foreign tax credit carryforwards | $ 16,600 |

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