Aircraft and Property, Plant and Equipment - Schedule of Property, Plant and Equipment Net (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross $ 140,428 $ 126,199
Less: Accumulated depreciation and amortization (19,793) (16,817)
Property, plant, and equipment, net 120,635 109,382
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 308 308
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 7,926 7,597
Vehicles and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 29,500 29,598
Deferred overhauls, net    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross 86,768 68,773
Construction-in-progress    
Property, Plant and Equipment [Line Items]    
Property, plant, and equipment, gross $ 15,926 $ 19,923