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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 |  |  |

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