Quarterly report pursuant to Section 13 or 15(d)

Business Segments and Customer Information, Major Customers (Details)

v3.8.0.1
Business Segments and Customer Information, Major Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue, Major Customer [Line Items]        
Revenues $ 174,164 $ 172,780 $ 565,318 $ 476,889
Percentage of revenue by customer 100.00% 100.00% 100.00% 100.00%
U.S. Postal Service        
Revenue, Major Customer [Line Items]        
Revenues $ 43,833 $ 44,433 $ 136,261 $ 135,025
Percentage of revenue by customer 25.20% 25.70% 24.10% 28.30%
U.S. Navy        
Revenue, Major Customer [Line Items]        
Revenues $ 38,895 $ 43,424 $ 143,421 $ 109,884
Percentage of revenue by customer 22.30% 25.10% 25.40% 23.00%
U.S. Army        
Revenue, Major Customer [Line Items]        
Revenues $ 45,717 $ 40,155 $ 150,217 $ 96,656
Percentage of revenue by customer 26.30% 23.30% 26.60% 20.20%
U.S. Air Force        
Revenue, Major Customer [Line Items]        
Revenues $ 2,967 $ 757 $ 5,807 $ 2,614
Percentage of revenue by customer 1.70% 0.40% 1.00% 0.60%
Total - DoD        
Revenue, Major Customer [Line Items]        
Revenues $ 87,579 $ 84,336 $ 299,445 $ 209,154
Percentage of revenue by customer 50.30% 48.80% 53.00% 43.80%
Commercial aviation        
Revenue, Major Customer [Line Items]        
Revenues $ 30,637 $ 32,489 $ 94,706 $ 98,099
Percentage of revenue by customer 17.60% 18.80% 16.80% 20.60%
Other commercial        
Revenue, Major Customer [Line Items]        
Revenues $ 2,833 $ 2,720 $ 9,270 $ 7,807
Percentage of revenue by customer 1.60% 1.60% 1.60% 1.60%
Total - Commercial        
Revenue, Major Customer [Line Items]        
Revenues $ 33,470 $ 35,209 $ 103,976 $ 105,906
Percentage of revenue by customer 19.20% 20.40% 18.40% 22.20%
Other civilian agencies        
Revenue, Major Customer [Line Items]        
Revenues $ 9,282 $ 8,802 $ 25,636 $ 26,804
Percentage of revenue by customer 5.30% 5.10% 4.50% 5.70%