Leases (Schedule of components of lease costs) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Amortization of right of use assets	$ 908	$ 0	$ 2,696	$ 0
Interest	77	0	256	0
Operating lease cost	2,324	3,760	5,805	10,524
Total lease cost	$ 3,309	$ 3,760	$ 8,757	$ 10,524
Operating leases, weighted average remaining lease term (in years)	2 years 8 months 12 days	3 years 6 months	2 years 8 months 12 days	3 years 6 months
Finance leases, weighted average remaining lease term (in years)	2 years 1 month 6 days		2 years 1 month 6 days
Operating leases, weighted average discount rate (percent)	7.00%	7.00%	7.00%	7.00%
Finance leases, weighted average discount rate (percent)	4.00%	0.00%	4.00%	0.00%

Amount of interest expense on finance lease liability.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

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- Definition

Amount of amortization expense attributable to right-of-use asset from finance lease.

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Weighted average discount rate for finance lease calculated at point in time.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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