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BUSINESS COMBINATIONS (2015 Acquisitions) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Goodwill | $ 453,105 | $ 478,523 | $ 465,154
Thermo Fluids Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 7,301 |  |
Accounts receivables, measurement period adjustment | (284) |  |
Inventories and supplies | 1,791 |  |
Inventories and supplies, measurement period adjustment | 0 |  |
Prepaid expenses and other current assets | 665 |  |
Prepaid expenses and other current assets, measurement period adjustment | 0 |  |
Property, plant and equipment | 27,641 |  |
Property, plant and equipment, measurement period adjustment | (1,221) |  |
Permits and other intangibles | 18,100 |  |
Permits and other intangibles, measurement period adjustment | 0 |  |
Current liabilities | (5,884) |  |
Current liabilities, measurement period adjustment | (39) |  |
Closure and post-closure liabilities, less current portion | (2,333) |  |
Closure and post-closure liabilities, less current portion, measurement period adjustment | (657) |  |
Deferred taxes, unrecognized tax benefits and other long-term liabilities | (9,174) |  |
Deferred taxes, unrecognized tax benefits and other long-term liabilities, measurement period adjustments | 856 |  |
Total identifiable net assets | 38,107 |  |
Total identifiable net assets, measurement period adjustment | (1,345) |  |
Goodwill | 41,229 |  |
Goodwill, measurement period adjustment | 2,095 |  |
Total purchase price, net of cash acquired | 79,336 |  |
Total purchase price, net of cash acquired, measurement period adjustment | 750 |  |
At Acquisition Dates As Reported December 31, 2016 | Thermo Fluids Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 7,585 |  |
Inventories and supplies | 1,791 |  |
Prepaid expenses and other current assets | 665 |  |
Property, plant and equipment | 28,862 |  |
Permits and other intangibles | 18,100 |  |
Current liabilities | (5,845) |  |
Closure and post-closure liabilities, less current portion | (1,676) |  |
Deferred taxes, unrecognized tax benefits and other long-term liabilities | (10,030) |  |
Total identifiable net assets | 39,452 |  |
Goodwill | 39,134 |  |
Total purchase price, net of cash acquired | $ 78,586 |  |

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