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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | The domestic and foreign components of income before (benefit) provision for income taxes were as follows (in thousands):
| For the Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Domestic | $ | 101,714 |  |  | $ | 87,328 |  |  | $ | 164,105 |
Foreign | (43,025 | ) |  | (78,612 | ) |  | (54,459 | )
Total | $ | 58,689 |  |  | $ | 8,716 |  |  | $ | 109,646 |
Schedule of Components of Provision for Income Taxes | The (benefit) provision for income taxes consisted of the following (in thousands):
| For the Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |
Federal | $ | 25,613 |  |  | $ | 14,798 |  |  | $ | 46,775 |
State | 11,083 |  |  | 8,763 |  |  | 11,120 |
Foreign | 4,589 |  |  | 9,844 |  |  | 5,719 |
| 41,285 |  |  | 33,405 |  |  | 63,614 |
Deferred |  |  |  |  |
Federal | (85,488 | ) |  | 21,814 |  |  | 12,254 |
State | 1,085 |  |  | 1,644 |  |  | 2,766 |
Foreign | 1,068 |  |  | (8,274 | ) |  | (13,090 | )
| (83,335 | ) |  | 15,184 |  |  | 1,930 |
(Benefit) provision for income taxes | $ | (42,050 | ) |  | $ | 48,589 |  |  | $ | 65,544 |
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,
| 2017 |  | 2016 |  | 2015
Tax expense at US statutory rate | $ | 20,541 |  |  | $ | 3,051 |  |  | $ | 38,376 |
State income taxes, net of federal benefit | 4,547 |  |  | 6,010 |  |  | 8,449 |
Foreign rate differential | 3,733 |  |  | 3,646 |  |  | 3,951 |
Valuation allowance | 16,552 |  |  | 22,564 |  |  | 1,824 |
Uncertain tax position interest and penalties | 3,730 |  |  | 107 |  |  | 32 |
Goodwill impairment | — |  |  | 11,905 |  |  | 10,974 |
Other | 1,856 |  |  | 1,306 |  |  | 1,938 |
Adjustment for Tax Cuts and Jobs Act | (93,009 | ) |  | — |  |  | — |
(Benefit) provision for income taxes | $ | (42,050 | ) |  | $ | 48,589 |  |  | $ | 65,544 |
Schedule of Deferred Tax Assets and Liabilities | The components of the total net deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows (in thousands):
| 2017 |  | 2016
Deferred tax assets: |  |  |
Provision for doubtful accounts | 7,417 |  |  | 11,189 |
Closure, post-closure and remedial liabilities | 28,189 |  |  | 40,829 |
Accrued expenses | 15,382 |  |  | 19,826 |
Accrued compensation | 1,903 |  |  | 2,747 |
Net operating loss carryforwards(1) | 46,650 |  |  | 46,752 |
Tax credit carryforwards(2) | 17,504 |  |  | 25,348 |
Uncertain tax positions accrued interest and federal benefit | 921 |  |  | 1,241 |
Stock-based compensation | 2,268 |  |  | 1,993 |
Other | 3,258 |  |  | 555 |
Total deferred tax assets | 123,492 |  |  | 150,480 |
Deferred tax liabilities: |  |  |
Property, plant and equipment | (144,325 | ) |  | (207,799 | )
Permits and other intangible assets | (107,407 | ) |  | (161,295 | )
Prepaids | (8,080 | ) |  | (11,030 | )
Total deferred tax liabilities | (259,812 | ) |  | (380,124 | )
Total net deferred tax liability before valuation allowance | (136,320 | ) |  | (229,644 | )
Less valuation allowance | (68,355 | ) |  | (55,189 | )
Net deferred tax liabilities | $ | (204,675 | ) |  | $ | (284,833 | )
___________________________________
(1) | As of December 31, 2017, the net operating loss carryforwards included (i) state net operating loss carryovers of $186.7 million which will begin to expire in 2018, (ii) federal net operating loss carryforwards of $48.0 million which will begin to expire in 2025, and (iii) foreign net operating loss carryforwards of $116.1 million which will begin to expire in 2018.
(2) | As of December 31, 2017, the foreign tax credit carryforwards of $17.5 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, 2015 through December 31, 2017, were as follows (in thousands):
| 2017 |  | 2016 |  | 2015
Unrecognized tax benefits as of January 1 | $ | 1,738 |  |  | $ | 2,064 |  |  | $ | 2,537 |
Additions to current year tax positions | 1,457 |  |  | — |  |  | — |
Additions to prior year tax positions | 2,031 |  |  | — |  |  | — |
Settlements | (231 | ) |  | (533 | ) |  | (217 | )
Foreign currency translation | 126 |  |  | 207 |  |  | (256 | )
Unrecognized tax benefits as of December 31 | $ | 5,121 |  |  | $ | 1,738 |  |  | $ | 2,064 |

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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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