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Business Segments and Customer Information - Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 180,996 | $ 168,931 | $ 170,394 | $ 176,897 | $ 194,795 | $ 174,164 | $ 193,860 | $ 197,294 | $ 697,218 | $ 760,113 | $ 691,790
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
USPS |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 175,339 | $ 180,205 | $ 181,215
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 25.10% | 23.70% | 26.20%
U.S. Navy |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 160,952 | $ 206,644 | $ 190,155
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 23.10% | 27.20% | 27.50%
U.S. Army |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 156,519 | $ 188,462 | $ 139,764
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 22.50% | 24.80% | 20.20%
U.S. Air Force |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 17,023 | $ 7,123 | $ 3,482
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 2.40% | 0.90% | 0.50%
Total - DoD |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 334,494 | $ 402,229 | $ 333,401
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 48.00% | 52.90% | 48.20%
Commercial Aviation |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 135,864 | $ 126,960 | $ 131,067
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 19.50% | 16.70% | 19.00%
Other Commercial |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 14,742 | $ 12,498 | $ 10,721
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 2.10% | 1.70% | 1.50%
Total - Commercial |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 150,606 | $ 139,458 | $ 141,788
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 21.60% | 18.40% | 20.50%
Other Government |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 36,779 | $ 38,221 | $ 35,386
Percentage of revenue by customer |  |  |  |  |  |  |  |  | 5.30% | 5.00% | 5.10%

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