Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Summary Of Major Accounting Policies Goodwill Impairment (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 0		$ 15,000	$ 0	$ 303,005	$ 0
Subsea Products [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 51,000			51,000
Subsea Projects [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		130,000			130,000
Asset Integrity [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		111,000			111,000
Advanced Technologies [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 11,000			$ 11,000