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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

X

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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Amount of lease payments to be received by lessor for operating lease.

+ References

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-Publisher FASB
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- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

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Amount of sublease income excluding finance and operating lease expense.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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