Annual report pursuant to Section 13 and 15(d)

Nature of Business and Significant Accounting Policies - Narrative (Details)

v3.22.0.1
Nature of Business and Significant Accounting Policies - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
contract
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
Property, Plant and Equipment [Line Items]        
Percentage of contracts with the government 57.00% 69.00% 68.00%  
Number of contract types | contract 3      
Costs and operating expenses $ 729,333 $ 606,896 $ 692,370  
Deferred compensation plan expense 433 970 1,700  
Net income (loss) 7,966 (5,171) 37,024  
Selling, General and Administrative Expenses        
Property, Plant and Equipment [Line Items]        
Net income (loss) 626 $ 863 $ 1,000  
Inventories        
Property, Plant and Equipment [Line Items]        
Costs and operating expenses $ 24,400      
Minimum        
Property, Plant and Equipment [Line Items]        
Lease payment term (in years)       2 years
Maximum        
Property, Plant and Equipment [Line Items]        
Lease payment term (in years)       15 years
Other Capitalized Property Plant and Equipment | Minimum        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, useful life (in years) 3 years      
Other Capitalized Property Plant and Equipment | Maximum        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, useful life (in years) 15 years      
Land, Buildings and Improvements | Minimum        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, useful life (in years) 15 years      
Land, Buildings and Improvements | Maximum        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, useful life (in years) 20 years