Business Divestiture - Net Gain on Sale (Details) - Operations and maintenance - Disposal Group, Disposed of by Sale, Not Discontinued Operations $ in Thousands	6 Months Ended
Jun. 28, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds received	$ 15,976
Estimated receivable from amount held back for retained obligations	7,199
Liabilities for loss-making contracts retained	(6,026)
Book value of net assets sold	(3,661)
Estimated working capital adjustment, post close1	(3,030)
Net gain on sale	$ 10,458

Disposal Group, Including Discontinued Operation, Discount

No definition available.

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- Definition

Disposal Group, Including Discontinued Operation, Liabilities For Onerous Contracts Assumed By Buyer

+ References

No definition available.

+ Details

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- Definition

Disposal Group, Including Discontinued Operation, Net Assets, Deconsonlidated

+ References

No definition available.

+ Details

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- Definition

Disposal Group, Including Discontinued Operation, Net Working Capital True-Up

+ References

No definition available.

+ Details

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

+ Details

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- 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.

+ Details

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- Details

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