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			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 40,875	$ 303,005	$ 0	$ 343,880	$ 0
Subsea Products [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		51,302
Subsea Projects [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		129,562
Asset Integrity [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		110,753
Advanced Technologies [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 11,388