Quarterly report pursuant to Section 13 or 15(d)

Business Segments and Customer Information, Major Customers (Details)

v3.7.0.1
Business Segments and Customer Information, Major Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue, Major Customer [Line Items]        
Revenues $ 193,860 $ 160,473 $ 391,154 $ 304,109
Percentage of revenue by customer 100.00% 100.00% 100.00% 100.00%
U.S. Postal Service        
Revenue, Major Customer [Line Items]        
Revenues $ 45,959 $ 44,295 $ 92,428 $ 90,592
Percentage of revenue by customer 23.70% 27.60% 23.60% 29.80%
U.S. Navy        
Revenue, Major Customer [Line Items]        
Revenues $ 52,030 $ 36,569 $ 104,526 $ 66,460
Percentage of revenue by customer 26.80% 22.80% 26.70% 21.90%
U.S. Army        
Revenue, Major Customer [Line Items]        
Revenues $ 50,399 $ 34,291 $ 104,500 $ 56,501
Percentage of revenue by customer 26.00% 21.40% 26.70% 18.50%
U.S. Air Force        
Revenue, Major Customer [Line Items]        
Revenues $ 1,822 $ 876 $ 2,840 $ 1,857
Percentage of revenue by customer 0.90% 0.50% 0.70% 0.60%
Total - DoD        
Revenue, Major Customer [Line Items]        
Revenues $ 104,251 $ 71,736 $ 211,866 $ 124,818
Percentage of revenue by customer 53.70% 44.70% 54.10% 41.00%
Commercial aviation        
Revenue, Major Customer [Line Items]        
Revenues $ 32,265 $ 32,064 $ 64,069 $ 65,610
Percentage of revenue by customer 16.70% 20.00% 16.40% 21.60%
Other commercial        
Revenue, Major Customer [Line Items]        
Revenues $ 3,308 $ 2,804 $ 6,437 $ 5,087
Percentage of revenue by customer 1.70% 1.70% 1.70% 1.70%
Total - Commercial        
Revenue, Major Customer [Line Items]        
Revenues $ 35,573 $ 34,868 $ 70,506 $ 70,697
Percentage of revenue by customer 18.40% 21.70% 18.10% 23.30%
Other civilian agencies        
Revenue, Major Customer [Line Items]        
Revenues $ 8,077 $ 9,574 $ 16,354 $ 18,002
Percentage of revenue by customer 4.20% 6.00% 4.20% 5.90%