Revenue (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue from External Customers by Products and Services

			Three Months Ended						Six Months Ended
(in thousands)			Jun 30, 2020		Jun 30, 2019		Mar 31, 2020		Jun 30, 2020		Jun 30, 2019
Business Segment:
	Energy Services and Products
		Remotely Operated Vehicles	$	98,778	$	120,363	$	111,780	$	210,558	$	220,709
		Subsea Products	130,655		138,910		194,838		325,493		267,754
		Subsea Projects	56,326		75,104		61,455		117,781		164,832
		Asset Integrity	48,077		61,156		59,132		107,209		121,845
	Total Energy Services and Products		333,836		395,533		427,205		761,041		775,140
	Advanced Technologies		93,380		100,248		109,463		202,843		214,527
		Total	$	427,216	$	495,781	$	536,668	$	963,884	$	989,667

Revenue from External Customers by Geographic Areas

			Three Months Ended						Six Months Ended
(in thousands)			Jun 30, 2020		Jun 30, 2019		Mar 31, 2020		Jun 30, 2020		Jun 30, 2019
Geographic Operating Areas:
	Foreign:
		Africa	$	51,649	$	61,390	$	63,417	$	115,066	$	148,496
		United Kingdom	62,426		65,058		60,787		123,213		118,356
		Norway	45,423		60,252		52,184		97,607		102,718
		Asia and Australia	37,122		43,123		45,680		82,802		84,549
		Brazil	19,117		23,658		26,489		45,606		41,421
		Other	22,625		28,334		24,659		47,284		49,556
	Total Foreign		238,362		281,815		273,216		511,578		545,096
	United States		188,854		213,966		263,452		452,306		444,571
Total			$	427,216	$	495,781	$	536,668	$	963,884	$	989,667

Revenue by Timing of Transfer of Goods or Services

Timing of Transfer of Goods or Services:
	Revenue recognized over time	$	396,773	$	455,937	$	498,307	$	895,080	$	917,182
	Revenue recognized at a point in time	30,443		39,844		38,361		68,804		72,485
Total		$	427,216	$	495,781	$	536,668	$	963,884	$	989,667

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)	Jun 30, 2020		Dec 31, 2019
Contract assets	$	223,405	$	221,288
Contract liabilities	51,763		117,342