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BUSINESS COMBINATIONS (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Goodwill | $ 478,728 | $ 465,154
2016 Acquisitions |  |
Business Acquisition [Line Items] |  |
Accounts receivable | 16,242 |
Measurement period adjustments, accounts receivable | 475 |
Inventories and supplies | 12,688 |
Measurement period adjustment, inventories and supplies | 173 |
Prepaid and other current assets | 752 |
Measurement period adjustment, prepaid and other current assets | (25) |
Property, plant and equipment | 143,916 |
Measurement period adjustments, property, plant and equipment | 891 |
Permits and other intangibles | 28,856 |
Measurement period adjustments, permits and other intangibles | 0 |
Current liabilities | (19,905) |
Measurement period adjustments, current liabilities | 353 |
Closure and post-closure liabilities | (3,004) |
Measurement period adjustments, closure and post-closure liabilities | (596) |
Remedial liabilities, less current portion | (2,545) |
Measurement period adjustments, remedial liabilities, less current portion | (504) |
Deferred taxes, unrecognized tax benefits and other long-term liabilities | (20,219) |
Measurement period adjustments, deferred taxes, unrecognized tax benefits and other long-term liabilities | (3,200) |
Total identifiable net assets | 156,781 |
Measurement period adjustments, total identifiable net assets | (2,433) |
Goodwill | 47,977 |
Measurement period adjustments, goodwill | 2,186 |
Total purchase price, net of cash acquired | 204,758 |
Measurement period adjustments, total purchase price, net of cash acquired | $ (247) |
At Acquisition Dates | 2016 Acquisitions |  |
Business Acquisition [Line Items] |  |
Accounts receivable |  | 15,767
Inventories and supplies |  | 12,515
Prepaid and other current assets |  | 777
Property, plant and equipment |  | 143,025
Permits and other intangibles |  | 28,856
Current liabilities |  | (20,258)
Closure and post-closure liabilities |  | (2,408)
Remedial liabilities, less current portion |  | (2,041)
Deferred taxes, unrecognized tax benefits and other long-term liabilities |  | (17,019)
Total identifiable net assets |  | 159,214
Goodwill |  | 45,791
Total purchase price, net of cash acquired |  | $ 205,005

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