Revenue Recognition (Adoption of ASC 606) - Contracts with Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 337,466
Products
Disaggregation of Revenue [Line Items]
Revenues	265,052	$ 351,132	$ 433,012
Services
Disaggregation of Revenue [Line Items]
Revenues	72,414
Intercompany
Disaggregation of Revenue [Line Items]
Revenues	0
Intercompany | Products
Disaggregation of Revenue [Line Items]
Revenues	0
Intercompany | Services
Disaggregation of Revenue [Line Items]
Revenues	0
Western Hemisphere | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	211,240
Western Hemisphere | Operating Segments | Products
Disaggregation of Revenue [Line Items]
Revenues	170,282
Western Hemisphere | Operating Segments | Services
Disaggregation of Revenue [Line Items]
Revenues	40,958
Eastern Hemisphere | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	91,406
Eastern Hemisphere | Operating Segments | Products
Disaggregation of Revenue [Line Items]
Revenues	71,719
Eastern Hemisphere | Operating Segments | Services
Disaggregation of Revenue [Line Items]
Revenues	19,687
Asia Pacific | Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	34,820
Asia Pacific | Operating Segments | Products
Disaggregation of Revenue [Line Items]
Revenues	23,051
Asia Pacific | Operating Segments | Services
Disaggregation of Revenue [Line Items]
Revenues	$ 11,769