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BUSINESS COMBINATIONS (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 525,013 |  | $ 514,189 | $ 478,523
Veolia Business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable, including unbilled receivable |  | $ 39,558 |  |
Inventories and supplies |  | 1,126 |  |
Prepaid expenses and other current assets |  | 828 |  |
Property, plant and equipment |  | 72,243 |  |
Permits and other intangibles |  | 5,140 |  |
Current liabilities |  | (18,372) |  |
Closure and post-closure liabilities |  | (354) |  |
Total identifiable net assets |  | 100,169 |  |
Goodwill |  | 24,331 |  |
Total purchase price |  | $ 124,500 |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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