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Nature of Operations - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
sales_agency
region
sales_agent
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]      
Inventory adjustments $ 0   $ 3,300
Reduction of full-time equivalent headcount, percent   51.00%  
Decrease in operating expense $ 3,600 $ 8,400  
Restructuring costs and asset impairment charges   1,800  
Number of geographic regions | region 6    
Sales Coverage, Number Of Sales Agencies | sales_agency 50    
Number of sales agents | sales_agent 10    
Provision for slow-moving and obsolete inventories $ (17) 1,400 (3,281)
Restructuring 111 1,662 0
Facilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring $ 100 $ 700  
Military maritime      
Restructuring Cost and Reserve [Line Items]      
Increase (decrease) in revenue     $ (33,900)