Quarterly report pursuant to Section 13 or 15(d)

Business Segments and Customer Information - Major Customers (Details)

v3.20.2
Business Segments and Customer Information - Major Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue, Major Customer [Line Items]        
Revenues $ 165,505 $ 198,326 $ 511,638 $ 557,356
DoD        
Revenue, Major Customer [Line Items]        
Revenues 56,935 85,053 185,956 222,834
Other government        
Revenue, Major Customer [Line Items]        
Revenues 59,596 50,419 169,252 158,933
Commercial        
Revenue, Major Customer [Line Items]        
Revenues $ 48,974 $ 62,854 $ 156,430 $ 175,589
Customer Concentration Risk | Sales Revenue, Net        
Revenue, Major Customer [Line Items]        
Percentage of revenue by customer 100.00% 100.00% 100.00% 100.00%
Customer Concentration Risk | Sales Revenue, Net | DoD        
Revenue, Major Customer [Line Items]        
Percentage of revenue by customer 34.00% 43.00% 36.00% 40.00%
Customer Concentration Risk | Sales Revenue, Net | Other government        
Revenue, Major Customer [Line Items]        
Percentage of revenue by customer 36.00% 25.00% 33.00% 29.00%
Customer Concentration Risk | Sales Revenue, Net | Commercial        
Revenue, Major Customer [Line Items]        
Percentage of revenue by customer 30.00% 32.00% 31.00% 31.00%