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Leases (Narrative) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Lessee, Lease, Description [Line Items] |  |
Weighted average remaining lease term | 14 years 7 months 6 days |
Discount rate | 3.90% |
Weighted average remaining finance lease term | 3 years 1 month 6 days |
Finance discount rate | 3.70% |
Net book value | $ 483,981,000 | $ 492,127,000
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 | $ 8,225,000 | 8,280,000
Yard And Others [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Net book value | 16,997,000 | 17,369,000
Finance leases [Member] |  |
Lessee, Lease, Description [Line Items] |  |
Net book value | 25,222,000 | 25,649,000
Net book value | $ 25,222,000 | $ 25,649,000

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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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