Segment Information - Geographic segment information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	$ 248,181	$ 244,328
United States
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	238,464	233,809
Middle East
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	2,760	3,616
Canada
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	5,749	6,299
Australia
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	789	254
Latin & South America
Revenue, Major Customer [Line Items]
Total property, plant, and equipment, net	$ 419	$ 350