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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Other Liabilities, Noncurrent [Abstract] |  |
Contract liabilities, net of current portion | $ 33,201 | $ 34,866
Asset retirement obligations | 7,944 | 7,647
Deferred payments related to acquisitions | 0 | 715
Other | 2,625 | 2,827
Other long-term liabilities | $ 43,770 | $ 46,055

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- Definition Noncurrent portion of 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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