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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | The domestic and foreign components of income before provision (benefit) for income taxes were as follows (in thousands):
| For the years ended December 31,
| 2019 |  | 2018 |  | 2017
Domestic | $ | 156,571 |  |  | $ | 115,070 |  |  | $ | 101,714 |
Foreign | (8,332 | ) |  | (20,588 | ) |  | (43,025 | )
Total | $ | 148,239 |  |  | $ | 94,482 |  |  | $ | 58,689 |
Schedule of Components of Provision for Income Taxes | The provision (benefit) for income taxes consisted of the following (in thousands):
| For the years ended December 31,
| 2019 |  | 2018 |  | 2017
Current: |  |  |  |  |
Federal | $ | 20,482 |  |  | $ | (7,677 | ) |  | $ | 25,613 |
State | 14,564 |  |  | 12,653 |  |  | 11,083 |
Foreign | 7,448 |  |  | 4,781 |  |  | 4,589 |
| 42,494 |  |  | 9,757 |  |  | 41,285 |
Deferred |  |  |  |  |
Federal | 7,933 |  |  | 19,899 |  |  | (85,488 | )
State | 550 |  |  | (1,205 | ) |  | 1,085 |
Foreign | (478 | ) |  | 395 |  |  | 1,068 |
| 8,005 |  |  | 19,089 |  |  | (83,335 | )
Provision (benefit) for income taxes | $ | 50,499 |  |  | $ | 28,846 |  |  | $ | (42,050 | )
Schedule of Effective Income Tax Rate Reconciliation | The effective income tax rate varied from the amount computed using the statutory federal income tax rate as follows (in thousands):
| For the years ended December 31,
| 2019 |  | 2018 |  | 2017
Tax expense at US statutory rate | $ | 31,130 |  |  | $ | 19,841 |  |  | $ | 20,541 |
State income taxes, net of federal benefit | 10,597 |  |  | 8,711 |  |  | 4,547 |
Foreign rate differential | 276 |  |  | (1,124 | ) |  | 3,733 |
Valuation allowance | 4,459 |  |  | 10,466 |  |  | 16,552 |
Uncertain tax position interest and penalties | 474 |  |  | (1,806 | ) |  | 3,730 |
Tax credits | (50 | ) |  | (9,799 | ) |  | — |
Non-deductible compensation | 1,922 |  |  | 1,813 |  |  | 256 |
Other | 1,691 |  |  | 1,032 |  |  | 1,600 |
Adjustment for Tax Cuts and Jobs Act | — |  |  | (288 | ) |  | (93,009 | )
Provision (benefit) for income taxes | $ | 50,499 |  |  | $ | 28,846 |  |  | $ | (42,050 | )
Schedule of Deferred Tax Assets and Liabilities | The components of the total net deferred tax assets and liabilities as of December 31, 2019 and 2018 were as follows (in thousands):
| 2019 |  | 2018
Deferred tax assets: |  |  |
Provision for doubtful accounts | $ | 8,949 |  |  | $ | 10,715 |
Closure, post-closure and remedial liabilities | 26,960 |  |  | 28,380 |
Operating lease liabilities | 40,879 |  |  | — |
Accrued expenses | 17,602 |  |  | 15,686 |
Accrued compensation | 7,155 |  |  | 7,774 |
Net operating loss carryforwards(1) | 50,824 |  |  | 43,284 |
Tax credit carryforwards(2) | 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 | )
___________________________________
(1) | As of December 31, 2019, the net operating loss carryforwards included (i) state net operating loss carryovers of $201.8 million which will begin to expire in 2020, (ii) federal net operating loss carryforwards of $25.5 million which will begin to expire in 2025 and (iii) foreign net operating loss carryforwards of $145.0 million which will begin to expire in 2020.
(2) As of December 31, 2019, the foreign tax credit carryforwards of $16.6 million will expire between 2020 and 2024.
Summary of Income Tax Contingencies | The changes to unrecognized tax benefits (excluding related penalties and interest) from January 1, 2017 through December 31, 2019, were as follows (in thousands):
| 2019 |  | 2018 |  | 2017
Unrecognized tax benefits as of January 1 | $ | 3,159 |  |  | $ | 5,121 |  |  | $ | 1,738 |
Additions to current year tax positions | — |  |  | — |  |  | 1,457 |
(Reductions) additions to prior year tax positions | 3,354 |  |  | (625 | ) |  | 2,031 |
Expirations | (209 | ) |  | (1,115 | ) |  | (231 | )
Foreign currency translation | 110 |  |  | (222 | ) |  | 126 |
Unrecognized tax benefits as of December 31 | $ | 6,414 |  |  | $ | 3,159 |  |  | $ | 5,121 |

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