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Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Equipment and Depreciation      
Property and equipment, Gross $ 1,318,213,000 $ 910,726,000  
Property and equipment, Net 1,068,718,000 729,127,000  
Accumulated amortization 249,495,000 181,599,000  
Frequent Flyer Program      
Estimated transportation period relating to Mileage Credits 22 months    
Estimated transportation period relating to Mileage Credits accumulated 5 months    
Commissions and Other Selling Expenses      
Advertising expense 11,200,000 9,200,000 11,000,000
Capitalized Interest      
Weighted average borrowing rate (as a percent) 7.00% 6.60% 7.00%
Boeing 717-200 aircraft and engines | Minimum
     
Property, Equipment and Depreciation      
Estimated useful lives 7 years    
Residual value (as a percent) 7.00%    
Boeing 717-200 aircraft and engines | Maximum
     
Property, Equipment and Depreciation      
Estimated useful lives 11 years    
Residual value (as a percent) 34.00%    
Boeing 767-300 aircraft and engines | Minimum
     
Property, Equipment and Depreciation      
Estimated useful lives 7 years    
Residual value (as a percent) 0.00%    
Boeing 767-300 aircraft and engines | Maximum
     
Property, Equipment and Depreciation      
Estimated useful lives 20 years    
Residual value (as a percent) 10.00%    
Airbus A330-200 aircraft and engines
     
Property, Equipment and Depreciation      
Estimated useful lives 25 years    
Residual value (as a percent) 10.00%    
Aircraft under capital leases | Minimum
     
Property, Equipment and Depreciation      
Estimated useful lives 8 years    
Aircraft under capital leases | Maximum
     
Property, Equipment and Depreciation      
Estimated useful lives 12 years    
Major rotable parts | Minimum
     
Property, Equipment and Depreciation      
Residual value (as a percent) 10.00%    
Major rotable parts | Maximum
     
Property, Equipment and Depreciation      
Residual value (as a percent) 15.00%    
Furniture, fixtures and other equipment | Minimum
     
Property, Equipment and Depreciation      
Estimated useful lives 3 years    
Furniture, fixtures and other equipment | Maximum
     
Property, Equipment and Depreciation      
Estimated useful lives 7 years    
Capitalized software
     
Property, Equipment and Depreciation      
Property and equipment, Net 15,400,000 16,000,000  
Amortization expense $ 7,700,000 $ 5,900,000 $ 6,700,000
Capitalized software | Minimum
     
Property, Equipment and Depreciation      
Estimated useful lives 3 years    
Capitalized software | Maximum
     
Property, Equipment and Depreciation      
Estimated useful lives 7 years