Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 108,508	$ 104,881
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Revenues	4,804	3,753
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Revenues	103,704	101,128
United States
Disaggregation of Revenue [Line Items]
Revenues	94,492	91,499
Asia
Disaggregation of Revenue [Line Items]
Revenues	1,548	1,452
Canada
Disaggregation of Revenue [Line Items]
Revenues	3,136	3,497
Europe
Disaggregation of Revenue [Line Items]
Revenues	4,775	5,352
Mexico
Disaggregation of Revenue [Line Items]
Revenues	1,970	834
Middle East
Disaggregation of Revenue [Line Items]
Revenues	1,537	1,584
Other
Disaggregation of Revenue [Line Items]
Revenues	$ 1,050	$ 663