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Leases (Narrative) (Details) - USD ($) | Sep. 30, 2021 | Aug. 13, 2021 | Dec. 31, 2020
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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

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- 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 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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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 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121609121&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=121609121&loc=SL77918673-209980 + Details
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