Reportable Segments - Schedule of Assets by Reportable Segment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Total assets $ 705,521 $ 727,305
Government gross profit    
Segment Reporting Information [Line Items]    
Total assets 255,055 295,153
Commercial gross profit    
Segment Reporting Information [Line Items]    
Total assets 17,957 21,070
Corporate    
Segment Reporting Information [Line Items]    
Total assets 49,686 [1] 51,756 [1]
Fixed Assets    
Segment Reporting Information [Line Items]    
Total assets $ 382,823 [2] $ 359,326 [2]
[1] Corporate assets are comprised primarily of cash, prepaid and other current assets, and deferred tax assets
[2] Fixed assets are comprised of the aircraft fleet and fleet support assets including aircraft, net, aircraft support parts, net, and property, plant, and equipment, net. Property, plant, and equipment, net are primarily used to support the aircraft fleet, with minimal amounts allocated to the corporate function