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Leases (Narrative) (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	14 years 7 months 6 days
Discount rate	3.80%
Weighted average remaining finance lease term	3 years 1 month 6 days
Finance discount rate	3.60%
Net book value	$ 482,732,000	$ 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	$ 7,160,000	8,280,000
Yard And Others [Member]
Lessee, Lease, Description [Line Items]
Net book value	17,767,000	17,369,000
Finance leases [Member]
Lessee, Lease, Description [Line Items]
Net book value	24,927,000	25,649,000
Net book value	$ 24,927,000	$ 25,649,000

X

- Definition

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

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

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