Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue [Abstract]

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

Geographic Operating Areas:
	Foreign:
		Africa	$	55,087	$	80,512	$	43,026
		United Kingdom	45,319		66,746		46,643
		Norway	39,042		29,800		49,747
		Asia and Australia	38,946		45,867		46,310
		Brazil	18,828		10,692		16,801
		Other	19,639		14,604		26,823
	Total Foreign		216,861		248,221		229,350
	United States		199,552		197,955		254,825
Total			$	416,413	$	446,176	$	484,175

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

Timing of Transfer of Goods or Services:
	Revenue recognized over time	$	374,667
	Revenue recognized at a point in time	41,746
Total		$	416,413

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
(in thousands)			Mar 31, 2018		Mar 31, 2017		Dec 31, 2017
Business Segment:
	Energy Services and Products
		Remotely Operated Vehicles	$	85,594	$	94,022	$	91,584
		Subsea Products	126,688		150,639		156,398
		Subsea Projects	56,860		62,956		73,376
		Asset Integrity	61,288		52,658		64,830
	Total Energy Services and Products		330,430		360,275		386,188
	Advanced Technologies		85,983		85,901		97,987
		Total	$	416,413	$	446,176	$	484,175