Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 113,587	$ 108,646	$ 313,214	$ 317,069
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenues	5,542	3,857	15,523	11,341
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenues	108,045	104,789	297,691	305,728
United States
Disaggregation of Revenue [Line Items]
Revenues	102,945	93,395	278,191	275,152
Asia
Disaggregation of Revenue [Line Items]
Revenues	1,634	2,816	4,619	6,555
Canada
Disaggregation of Revenue [Line Items]
Revenues	2,615	3,437	7,876	10,755
Europe
Disaggregation of Revenue [Line Items]
Revenues	3,728	4,327	11,796	14,128
Mexico
Disaggregation of Revenue [Line Items]
Revenues	1,226	1,682	4,221	3,519
Middle East
Disaggregation of Revenue [Line Items]
Revenues	904	1,317	4,659	4,382
Other
Disaggregation of Revenue [Line Items]
Revenues	$ 535	$ 1,672	$ 1,852	$ 2,578