Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 91,119	$ 103,542	$ 199,627	$ 208,423
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenues	5,177	4,003	9,981	7,756
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenues	85,942	99,539	189,646	200,667
United States
Disaggregation of Revenue [Line Items]
Revenues	80,754	90,258	175,246	181,757
Asia
Disaggregation of Revenue [Line Items]
Revenues	1,437	2,287	2,985	3,739
Canada
Disaggregation of Revenue [Line Items]
Revenues	2,125	3,821	5,261	7,318
Europe
Disaggregation of Revenue [Line Items]
Revenues	3,293	4,449	8,068	9,801
Mexico
Disaggregation of Revenue [Line Items]
Revenues	1,025	1,003	2,995	1,837
Middle East
Disaggregation of Revenue [Line Items]
Revenues	2,218	1,481	3,755	3,065
Other
Disaggregation of Revenue [Line Items]
Revenues	$ 267	$ 243	$ 1,317	$ 906