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SIGNIFICANT ACCOUNTING POLICIES (Remedial Liabilities) (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) site | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Regulatory Liabilities [Line Items] |  |  |
Remedial Liability | $ | $ 124,468 | $ 128,007 | $ 131,992
Period of time in years over which business acquisitions have been acquired | 15 years |  |
Superfund sites owned by third parties | 35 |  |
Superfund sites | 129 |  |
Minimum |  |  |
Regulatory Liabilities [Line Items] |  |  |
Remedial liabilities at acquisition, inflation rate | 1.01% |  |
Remedial liabilities at acquisition, risk-free interest rate | 1.37% |  |
Maximum |  |  |
Regulatory Liabilities [Line Items] |  |  |
Remedial liabilities at acquisition, inflation rate | 2.57% |  |
Remedial liabilities at acquisition, risk-free interest rate | 5.99% |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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