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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2018
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 Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Domestic | $ | 115,070 |  |  | $ | 101,714 |  |  | $ | 87,328 |
Foreign | (20,588 | ) |  | (43,025 | ) |  | (78,612 | )
Total | $ | 94,482 |  |  | $ | 58,689 |  |  | $ | 8,716 |
Schedule of Components of Provision for Income Taxes | The provision (benefit) for income taxes consisted of the following (in thousands):
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Current: |  |  |  |  |
Federal | $ | (7,677 | ) |  | $ | 25,613 |  |  | $ | 14,798 |
State | 12,653 |  |  | 11,083 |  |  | 8,763 |
Foreign | 4,781 |  |  | 4,589 |  |  | 9,844 |
| 9,757 |  |  | 41,285 |  |  | 33,405 |
Deferred |  |  |  |  |
Federal | 19,899 |  |  | (85,488 | ) |  | 21,814 |
State | (1,205 | ) |  | 1,085 |  |  | 1,644 |
Foreign | 395 |  |  | 1,068 |  |  | (8,274 | )
| 19,089 |  |  | (83,335 | ) |  | 15,184 |
Provision (benefit) for income taxes | $ | 28,846 |  |  | $ | (42,050 | ) |  | $ | 48,589 |
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 Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Tax expense at US statutory rate | $ | 19,841 |  |  | $ | 20,541 |  |  | $ | 3,051 |
State income taxes, net of federal benefit | 8,711 |  |  | 4,547 |  |  | 6,010 |
Foreign rate differential | (1,124 | ) |  | 3,733 |  |  | 3,646 |
Valuation allowance | 10,466 |  |  | 16,552 |  |  | 22,564 |
Uncertain tax position interest and penalties | (1,806 | ) |  | 3,730 |  |  | 107 |
Goodwill impairment | — |  |  | — |  |  | 11,905 |
Tax credits | (9,799 | ) |  | — |  |  | — |
Other | 2,845 |  |  | 1,856 |  |  | 1,306 |
Adjustment for Tax Cuts and Jobs Act | (288 | ) |  | (93,009 | ) |  | — |
Provision (benefit) for income taxes | $ | 28,846 |  |  | $ | (42,050 | ) |  | $ | 48,589 |
Schedule of Deferred Tax Assets and Liabilities | The components of the total net deferred tax assets and liabilities at December 31, 2018 and 2017 were as follows (in thousands):
| 2018 |  | 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(1) | 43,284 |  |  | 46,650 |
Tax credit carryforwards(2) | 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 | )
___________________________________
(1) | As of December 31, 2018, the net operating loss carryforwards included (i) state net operating loss carryovers of $185.1 million which will begin to expire in 2019, (ii) federal net operating loss carryforwards of $49.8 million which will begin to expire in 2025, and (iii) foreign net operating loss carryforwards of $103.3 million which will begin to expire in 2019.
(2) | As of December 31, 2018, the foreign tax credit carryforwards of $16.5 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, 2016 through December 31, 2018, were as follows (in thousands):
| 2018 |  | 2017 |  | 2016
Unrecognized tax benefits as of January 1 | $ | 5,121 |  |  | $ | 1,738 |  |  | $ | 2,064 |
Additions to current year tax positions | — |  |  | 1,457 |  |  | — |
(Reductions) additions to prior year tax positions | (625 | ) |  | 2,031 |  |  | — |
Expirations | (1,115 | ) |  | (231 | ) |  | (533 | )
Foreign currency translation | (222 | ) |  | 126 |  |  | 207 |
Unrecognized tax benefits as of December 31 | $ | 3,159 |  |  | $ | 5,121 |  |  | $ | 1,738 |

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