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Fair Value Measurements. (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value Disclosures [Abstract] |  |
Property and equipment held-for-sale at fair value | $ 20,535,000 | $ 48,548,000

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- Definition Fair value portion of assets classified as held for sale. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration