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Fair Value Disclosures - Financial instruments measured at fair value on non-recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Assets held for sale | $ 4,032 | $ 5,385
Fair value on a non-recurring basis |  |
Assets: |  |
Assets held for sale | 4,032 | 5,385
Fair value on a non-recurring basis | Level 1 |  |
Assets: |  |
Assets held for sale | 0 |
Fair value on a non-recurring basis | Level 2 |  |
Assets: |  |
Assets held for sale | 4,032 | $ 5,385
Fair value on a non-recurring basis | Level 3 |  |
Assets: |  |
Assets held for sale | $ 0 |

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- Definition Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220 + Details
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- References No definition available. + Details
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