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Condensed Consolidated Financial Statements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts receivable $ 61,327   $ 42,731 [1]
Income Statement:      
Total operating revenues 783,400 $ 747,166 [1]  
Salaries, wages and benefits 306,719 297,667 [1]  
Other operating expenses 68,389 62,675 [1]  
Total operating expenses 695,225 670,871 [1]  
ASSETS      
Other long-term assets 69,182   65,341 [1]
LIABILITIES:      
Other long-term liabilities 62,363   58,662 [1]
Previously Reported | ASU 2014-09      
Income Statement:      
Salaries, wages and benefits   300,039  
Other operating expenses   75,088  
Total operating expenses   689,120  
ASSETS      
Other long-term assets     49,220
LIABILITIES:      
Other long-term liabilities     42,541
Adjustments | ASU 2014-09      
Income Statement:      
Total operating revenues 765,415 (18,249)  
Salaries, wages and benefits   (2,372)  
Other operating expenses   (12,413)  
Total operating expenses   (18,249)  
ASSETS      
Other long-term assets     16,121
LIABILITIES:      
Other long-term liabilities     16,121
Flying agreements      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts receivable 48,800   $ 33,900
Income Statement:      
Total operating revenues 767,964 734,529 [1]  
Flying agreements | Previously Reported | ASU 2014-09      
Income Statement:      
Total operating revenues 745,411    
Flying agreements | Adjustments | ASU 2014-09      
Income Statement:      
Total operating revenues   (10,882)  
Airport customer service and other      
Income Statement:      
Total operating revenues 15,436 12,637 [1]  
Airport customer service and other | Previously Reported | ASU 2014-09      
Income Statement:      
Total operating revenues 20,004    
Airport customer service and other | Adjustments | ASU 2014-09      
Income Statement:      
Total operating revenues   (7,367)  
Aircraft fuel      
Income Statement:      
Other operating expenses   18,433  
Total operating expenses 26,939 18,433 [1]  
Aircraft fuel | Previously Reported | ASU 2014-09      
Income Statement:      
Other operating expenses   34,310  
Aircraft fuel | Adjustments | ASU 2014-09      
Income Statement:      
Other operating expenses   (15,877)  
Airport related expenses      
Income Statement:      
Other operating expenses   31,948  
Total operating expenses 29,307 31,948 [1]  
Airport related expenses | Previously Reported | ASU 2014-09      
Income Statement:      
Other operating expenses   19,535  
Airport related expenses | Adjustments | ASU 2014-09      
Income Statement:      
Other operating expenses   12,413  
Up-front contract reimbursements      
Income Statement:      
Total operating revenues $ 400 $ 300  
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.