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Business Segments and Customer Information, Major Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 691,790 | $ 533,982 | $ 424,071
Percentage of revenue by customer | 100.00% | 100.00% | 100.00%
U. S. Postal Service |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 181,215 | $ 184,876 | $ 167,268
Percentage of revenue by customer | 26.20% | 34.60% | 39.40%
U.S. Navy |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 190,155 | $ 98,887 | $ 88,007
Percentage of revenue by customer | 27.50% | 18.50% | 20.70%
U.S. Army |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 139,764 | $ 80,086 | $ 101,714
Percentage of revenue by customer | 20.20% | 15.00% | 24.00%
U.S. Air Force |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 3,482 | $ 3,558 | $ 3,323
Percentage of revenue by customer | 0.50% | 0.70% | 0.80%
Total - DoD |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 333,401 | $ 182,531 | $ 193,044
Percentage of revenue by customer | 48.20% | 34.20% | 45.50%
Commercial Aviation |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 131,067 | $ 119,729 | $ 0
Percentage of revenue by customer | 19.00% | 22.40% | 0.00%
Other Commercial |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 10,721 | $ 4,653 | $ 3,680
Percentage of revenue by customer | 1.50% | 0.90% | 0.90%
Total - Commercial |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 141,788 | $ 124,382 | $ 3,680
Percentage of revenue by customer | 20.50% | 23.30% | 0.90%
Department of Energy |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 11,708 | $ 16,020 | $ 19,000
Percentage of revenue by customer | 1.70% | 3.00% | 4.50%
Social Security Administration |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 9,762 | $ 9,666 | $ 10,153
Percentage of revenue by customer | 1.40% | 1.80% | 2.40%
Other Government |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 13,916 | $ 16,507 | $ 30,926
Percentage of revenue by customer | 2.00% | 3.10% | 7.30%
Total - Other Civilian Agencies |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, by customer | $ 35,386 | $ 42,193 | $ 60,079
Percentage of revenue by customer | 5.10% | 7.90% | 14.20%

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