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Commitments and Contingencies Activity in Recorded Environmental Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |  |
Balance, beginning of year | $ 34,919 | $ 31,436 | $ 9,235 |  |  |
Expenditures | (1,818) | (2,667) | (4,039) |  |  |
Divestitures | 0 | 0 | (1,826) |  |  |
Accretion of discount | 896 | 793 | 902 |  |  |
Additions and revisions of estimates | 3,344 | 4,004 | 150 |  |  |
Reclass to liabilities held for sale | 0 | 0 | (5,253) |  |  |
Foreign currency translation adjustments and other | 2,467 | 1,353 | (2,359) |  |  |
Balance, end of year | 34,919 | 31,436 | 9,235 | $ 39,808 | $ 34,919 | $ 31,436
Less amounts reported in Accrued expenses |  |  |  | 2,290 | 2,324 | 1,443
Amounts reported in Other noncurrent liabilities |  |  |  | $ 37,518 | $ 32,595 | $ 29,993
Rockwood Holdings, Inc. |  |  |  |  |  |
Accrual for Environmental Loss Contingencies [Roll Forward] |  |  |  |  |  |
Acquisition of Rockwood | $ 0 | $ 0 | $ 34,626 |  |  |

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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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