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Business Segments and Customer Information - Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 168,931 | $ 174,164 | $ 516,222 | $ 565,318
U.S. Postal Service |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 43,031 | 43,833 | 130,151 | 136,261
U.S. Navy |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 37,013 | 38,895 | 115,294 | 143,421
U.S. Army |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 38,167 | 45,717 | 122,502 | 150,217
U.S. Air Force |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 4,822 | 2,967 | 12,046 | 5,807
Total - DoD |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 80,002 | 87,579 | 249,842 | 299,445
Commercial aviation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 32,641 | 30,637 | 98,213 | 94,706
Other commercial |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 3,386 | 2,833 | 10,418 | 9,270
Total - Commercial |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 36,027 | 33,470 | 108,631 | 103,976
Other government |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 9,871 | $ 9,282 | $ 27,598 | $ 25,636
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 | U.S. Postal Service |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 25.50% | 25.20% | 25.20% | 24.10%
Customer Concentration Risk | Sales Revenue, Net | U.S. Navy |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 21.90% | 22.30% | 22.40% | 25.40%
Customer Concentration Risk | Sales Revenue, Net | U.S. Army |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 22.60% | 26.30% | 23.70% | 26.60%
Customer Concentration Risk | Sales Revenue, Net | U.S. Air Force |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 2.90% | 1.70% | 2.30% | 1.00%
Customer Concentration Risk | Sales Revenue, Net | Total - DoD |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 47.40% | 50.30% | 48.40% | 53.00%
Customer Concentration Risk | Sales Revenue, Net | Commercial aviation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 19.30% | 17.60% | 19.00% | 16.80%
Customer Concentration Risk | Sales Revenue, Net | Other commercial |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 2.00% | 1.60% | 2.00% | 1.60%
Customer Concentration Risk | Sales Revenue, Net | Total - Commercial |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 21.30% | 19.20% | 21.00% | 18.40%
Customer Concentration Risk | Sales Revenue, Net | Other government |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 5.80% | 5.30% | 5.40% | 4.50%

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