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Leases (Narrative) (Details) - USD ($)	Sep. 30, 2021	Aug. 13, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease fixed term		2 years
Weighted average remaining lease term	14 years 1 month 6 days
Discount rate	3.70%
Weighted average remaining finance lease term	3 years
Finance discount rate	3.50%
Minimum [Member]
Lessee, Lease, Description [Line Items]
Operating lease fixed term	1 month
Finance lease term	1 month
Maximum [Member]
Lessee, Lease, Description [Line Items]
Operating lease fixed term	20 years
Finance lease term	6 years
Computer Equipment [Member]
Lessee, Lease, Description [Line Items]
Net book value	$ 6,616,000		$ 8,280,000
Yard And Others [Member]
Lessee, Lease, Description [Line Items]
Net book value	16,915,000		17,369,000
Finance leases [Member]
Lessee, Lease, Description [Line Items]
Net book value	$ 23,531,000		$ 25,649,000

X

- Definition

Amount, after accumulated amortization, of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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X

- 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.

+ References

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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- Definition

Discount rate used by lessee to determine present value of finance lease payments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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- Definition

Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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No definition available.

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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.

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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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