Revenue From Contracts With Customers - Unbilled Receivables (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Unbilled Revenues [Roll Forward]
Unbilled receivables at December 31, 2018	$ 44,032
Recognition of unbilled receivables	125,586
Revenues billed to customers	(138,628)
Unbilled receivables at September 30, 2019	30,990
New Venture
Unbilled Revenues [Roll Forward]
Unbilled receivables at December 31, 2018	38,430
Unbilled receivables at September 30, 2019	22,373
Imaging Services
Unbilled Revenues [Roll Forward]
Unbilled receivables at December 31, 2018	5,075
Unbilled receivables at September 30, 2019	7,016
Devices
Unbilled Revenues [Roll Forward]
Unbilled receivables at December 31, 2018	527
Unbilled receivables at September 30, 2019	$ 1,601