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INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Provision for doubtful accounts | $ 10,715 | $ 7,417
Closure, post-closure and remedial liabilities | 28,380 | 28,189
Accrued expenses | 15,686 | 15,382
Accrued compensation | 7,774 | 1,903
Net operating loss carryforwards | 43,284 | 46,650
Tax credit carryforwards | 16,909 | 17,504
Uncertain tax positions accrued interest and federal benefit | 519 | 921
Stock-based compensation | 3,440 | 2,268
Other | 7,067 | 3,258
Total deferred tax assets | 133,774 | 123,492
Deferred tax liabilities: |  |
Property, plant and equipment | (164,246) | (144,325)
Permits and other intangible assets | (103,539) | (107,407)
Prepaids | (9,187) | (8,080)
Total deferred tax liabilities | (276,972) | (259,812)
Total net deferred tax liability before valuation allowance | (143,198) | (136,320)
Less valuation allowance | (79,295) | (68,355)
Net deferred tax liabilities | (222,493) | $ (204,675)
State and local operating loss carryforwards | 185,100 |
Federal operating loss carryforwards | 49,800 |
Foreign operating loss carryforwards | 103,300 |
Foreign tax credit carryforwards | $ 16,500 |

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