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Environmental Matters - Summary of Environment Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Environmental Exit Cost [Line Items] |  |
Balance at beginning of year | $ 32,867 | $ 31,467
Obligations settled | (123) | (116)
Balance at end of year | 35,777 | 32,867
Current portion, included within accrued expenses and other current liabilities | 188 | 120
Asset retirement obligations | 35,589 | 32,747
Environmental Restoration Costs [Member] |  |
Environmental Exit Cost [Line Items] |  |
Balance at beginning of year | 3,614 | 3,537
Provision for new environmental losses | 292 | 918
Changes in estimates for previously incurred losses | 354 | 104
Obligations settled | (870) | (945)
Balance at end of year | 3,390 | 3,614
Current portion, included within accrued expenses and other current liabilities | 1,520 | 1,450
Asset retirement obligations | $ 1,870 | $ 2,164

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- Definition Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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