Revenue (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue from External Customers by Products and Services

			Three Months Ended						Nine Months Ended
(in thousands)			Sep 30, 2020		Sep 30, 2019 *		Jun 30, 2020 *		Sep 30, 2020		Sep 30, 2019 *
Business Segment:
	Energy Services and Products
		Subsea Robotics	$	119,617	$	151,492	$	119,234	$	378,621	$	432,548
		Manufactured Products	110,416		114,487		100,570		377,520		334,488
		Offshore Projects Group	73,212		89,115		73,840		221,306		289,193
		Integrity Management & Digital Solutions	53,933		65,332		53,969		172,631		198,057
	Total Energy Services and Products		357,178		420,426		347,613		1,150,078		1,254,286
	Aerospace and Defense Technologies		82,565		77,221		79,603		253,549		233,028
		Total	$	439,743	$	497,647	$	427,216	$	1,403,627	$	1,487,314
	*	Recast to reflect segment changes.
			Three Months Ended						Nine Months Ended
(in thousands)			Sep 30, 2020		Sep 30, 2019		Jun 30, 2020		Sep 30, 2020		Sep 30, 2019
Geographic Operating Areas:
	Foreign:
		Africa	$	43,077	$	73,901	$	51,649	$	158,143	$	222,397
		United Kingdom	68,568		61,914		62,426		191,781		180,270
		Norway	57,138		59,875		45,423		154,745		162,593
		Asia and Australia	30,715		42,662		37,122		113,517		127,211
		Brazil	19,296		25,404		19,117		64,902		66,825
		Other	22,071		14,178		22,625		69,355		63,734
	Total Foreign		240,865		277,934		238,362		752,443		823,030
	United States		198,878		219,713		188,854		651,184		664,284
Total			$	439,743	$	497,647	$	427,216	$	1,403,627	$	1,487,314
Timing of Transfer of Goods or Services:
	Revenue recognized over time		$	411,809	$	460,029	$	396,773	$	1,306,889	$	1,377,211
	Revenue recognized at a point in time		27,934		37,618		30,443		96,738		110,103
Total			$	439,743	$	497,647	$	427,216	$	1,403,627	$	1,487,314

Contract with Customer, Asset and Liability [Table Text Block]

The following table provides information about contract assets and contract liabilities from contracts with customers:

(in thousands)	Sep 30, 2020		Dec 31, 2019
Contract assets	$	220,760	$	221,288
Contract liabilities	45,566		117,342