Revenue From Contracts With Customers - Unbilled Receivables (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Unbilled Revenues
Unbilled receivables at December 31, 2019	$ 11,815
Recognition of unbilled receivables	76,561
Revenues billed to customers	(75,439)
Unbilled receivables at June 30, 2020	12,937
New Venture
Unbilled Revenues
Unbilled receivables at December 31, 2019	5,222
Unbilled receivables at June 30, 2020	5,515
Imaging and Reservoir Services
Unbilled Revenues
Unbilled receivables at December 31, 2019	6,539
Unbilled receivables at June 30, 2020	5,647
Devices
Unbilled Revenues
Unbilled receivables at December 31, 2019	54
Unbilled receivables at June 30, 2020	$ 1,775