Leases (Schedule of components of lease costs) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Amortization of right of use assets	$ 900	$ 0	$ 1,788	$ 0
Interest	85	0	179	0
Operating lease cost	1,624	5,367	3,481	6,764
Total lease cost	$ 2,609	$ 5,367	$ 5,448	$ 6,764
Operating leases, weighted average remaining lease term (in years)	3 years	3 years 4 months 24 days	3 years	3 years 4 months 24 days
Finance leases, weighted average remaining lease term (in years)	2 years 3 months 18 days		2 years 3 months 18 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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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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- Definition

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.

+ References

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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.

+ References

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