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Leases (Assets Recorded Under Capital Leases) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	$ 14,558,000	$ 16,597,000
Accumulated depreciation	(7,942,000)	(8,317,000)
Net book value	6,616,000	8,280,000
Yard And Others [Member]
Property, Plant and Equipment [Line Items]
Cost	32,314,000	28,234,000
Accumulated depreciation	(15,399,000)	(10,865,000)
Net book value	16,915,000	17,369,000
Finance leases [Member]
Property, Plant and Equipment [Line Items]
Cost	46,872,000	44,831,000
Accumulated depreciation	(23,341,000)	(19,182,000)
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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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