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Leases (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease renewal term | 5 years |  | 5 years |
Lease asset impairments |  | $ 9,800 | $ 9,410 | $ 9,786
Property and equipment impairment |  | 3,600 |  |
Sublease income | $ 500 | $ 400 | 1,400 | $ 2,200
Estimated aggregate sublease income to be received in the future | $ 5,200 |  | 5,200 |
COVID-19 |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Lease asset impairments |  |  | $ 2,100 |
Minimum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease terms | 3 years |  | 3 years |
Maximum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease terms | 5 years |  | 5 years |

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Amount of lease payments to be received by lessor for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919396-209981 + Details
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