Quarterly report pursuant to Section 13 or 15(d)

Business Segments and Customer Information, Major Customers (Details)

v3.4.0.3
Business Segments and Customer Information, Major Customers (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Revenue, Major Customer [Line Items]    
Revenue $ 143,636 $ 120,791
Percentage of revenue by customer 100.00% 100.00%
U.S. Postal Service [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 46,297 $ 44,180
Percentage of revenue by customer 32.20% 36.60%
U.S. Navy [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 29,891 $ 21,397
Percentage of revenue by customer 20.80% 17.70%
U.S. Army [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 22,210 $ 19,171
Percentage of revenue by customer 15.50% 15.90%
U.S. Air Force [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 981 $ 790
Percentage of revenue by customer 0.70% 0.60%
Total Department of Defense [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 53,082 $ 41,358
Percentage of revenue by customer 37.00% 34.20%
Commercial Aviation [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 33,546 $ 22,764
Percentage of revenue by customer 23.30% 18.90%
Other Commercial [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 2,283 $ 1,207
Percentage of revenue by customer 1.60% 1.00%
Total Commercial [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 35,829 $ 23,971
Percentage of revenue by customer 24.90% 19.90%
Department of Energy [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 2,903 $ 4,444
Percentage of revenue by customer 2.00% 3.70%
Social Security Administration [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 2,587 $ 2,450
Percentage of revenue by customer 1.80% 2.00%
Other Government [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 2,938 $ 4,388
Percentage of revenue by customer 2.10% 3.60%
Total-Other Civilian Agencies [Member]    
Revenue, Major Customer [Line Items]    
Revenue $ 8,428 $ 11,282
Percentage of revenue by customer 5.90% 9.30%