Inventory (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventory [Table Text Block]

(in thousands)		Mar 31, 2018		Dec 31, 2017
Inventory, net:
	Remotely operated vehicle parts and components	$	100,931	$	97,313
	Other inventory, primarily raw materials	84,078		117,969
	Total	$	185,009	$	215,282