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Business Segments and Customer Information - Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 189,111 | $ 170,394 | $ 359,030 | $ 347,291
USPS |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 42,112 | 43,089 | 84,795 | 87,120
U.S. Navy |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 22,202 | 35,696 | 42,807 | 78,281
U.S. Army |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 47,333 | 41,548 | 84,052 | 84,335
U.S. Air Force |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 5,545 | 4,943 | 10,922 | 7,224
Total - DoD |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 75,080 | 82,187 | 137,781 | 169,840
Commercial aviation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 54,086 | 34,037 | 102,561 | 65,572
Other commercial |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 5,090 | 3,444 | 10,174 | 7,032
Total - Commercial |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 59,176 | 37,481 | 112,735 | 72,604
Other government |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 12,743 | $ 7,637 | $ 23,719 | $ 17,727
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 | USPS |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 22.30% | 25.30% | 23.60% | 25.10%
Customer Concentration Risk | Sales Revenue, Net | U.S. Navy |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 11.80% | 20.90% | 11.90% | 22.50%
Customer Concentration Risk | Sales Revenue, Net | U.S. Army |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 25.00% | 24.40% | 23.40% | 24.30%
Customer Concentration Risk | Sales Revenue, Net | U.S. Air Force |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 2.90% | 2.90% | 3.10% | 2.10%
Customer Concentration Risk | Sales Revenue, Net | Total - DoD |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 39.70% | 48.20% | 38.40% | 48.90%
Customer Concentration Risk | Sales Revenue, Net | Commercial aviation |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 28.60% | 20.00% | 28.60% | 18.90%
Customer Concentration Risk | Sales Revenue, Net | Other commercial |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 2.70% | 2.00% | 2.80% | 2.00%
Customer Concentration Risk | Sales Revenue, Net | Total - Commercial |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 31.30% | 22.00% | 31.40% | 20.90%
Customer Concentration Risk | Sales Revenue, Net | Other government |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of revenue by customer | 6.70% | 4.50% | 6.60% | 5.10%

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