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
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 303,005	$ 15,000	$ 0
Subsea Products [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	51,000	19,000
Subsea Projects [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	130,000	6,100
Asset Integrity [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	111,000	$ 14,000
Advanced Technologies [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 11,000