Revenue (Tables)

6 Months Ended

Jun. 30, 2018

Revenue [Abstract]

Revenue from External Customers by Geographic Areas [Table Text Block]

Geographic Operating Areas:
	Foreign:
		Africa	$	61,966	$	74,759	$	55,087	$	117,053	$	155,271
		United Kingdom	50,999		74,714		45,319		96,318		141,460
		Norway	51,827		44,753		39,042		90,869		74,553
		Asia and Australia	43,448		51,281		38,946		82,394		97,148
		Brazil	13,461		7,253		18,828		32,289		17,945
		Other	14,811		16,744		19,639		34,450		31,348
	Total Foreign		236,512		269,504		216,861		453,373		517,725
	United States		242,162		245,532		199,552		441,714		443,487
Total			$	478,674	$	515,036	$	416,413	$	895,087	$	961,212

Revenue by Timing of Transfer of Goods or Services [Table Text Block]

		June 30, 2018
Timing of Transfer of Goods or Services:
	Revenue recognized over time	$	811,702
	Revenue recognized at a point in time	83,385
Total		$	895,087

Revenue from External Customers by Products and Services [Table Text Block]

The following table presents Revenue disaggregated by business segment, geographical region, and timing of transfer of goods or services.

			Three Months Ended						Six Months Ended
(in thousands)			June 30, 2018		June 30, 2017		March 31, 2018		June 30, 2018		June 30, 2017
Business Segment:
	Energy Services and Products
		Remotely Operated Vehicles	$	107,426	$	103,432	$	85,594	$	193,020	$	197,454
		Subsea Products	121,704		174,893		126,688		248,392		325,532
		Subsea Projects	78,036		75,545		56,860		134,896		138,501
		Asset Integrity	67,422		58,192		61,288		128,710		110,850
	Total Energy Services and Products		374,588		412,062		330,430		705,018		772,337
	Advanced Technologies		104,086		102,974		85,983		190,069		188,875
		Total	$	478,674	$	515,036	$	416,413	$	895,087	$	961,212