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Condensed Consolidated Financial Statements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Accounts receivable $ 71,240   $ 71,240   $ 42,731 [1]
Income Statement:          
Total operating revenues 805,515 $ 791,512 [1] 1,588,915 $ 1,538,678  
Salaries, wages and benefits 293,677 294,795 [1] 600,396 592,462  
Other operating expenses 69,263 62,126 [1] 137,653 124,801  
Total operating expenses 678,837 684,916 [1] 1,374,062 1,355,788  
ASSETS          
Other long-term assets 71,194   71,194   65,341 [1]
LIABILITIES:          
Other long-term liabilities 62,001   62,001   58,662 [1]
Previously Reported | ASU 2014-09          
Income Statement:          
Total operating revenues   809,759   1,575,174  
Salaries, wages and benefits   295,929   595,969  
Other operating expenses   75,174   150,262  
Total operating expenses   703,163   1,392,284  
ASSETS          
Other long-term assets         49,220
LIABILITIES:          
Other long-term liabilities         42,541
Adjustments | ASU 2014-09          
Income Statement:          
Total operating revenues   (18,247)   (36,496)  
Salaries, wages and benefits   (1,134)   (3,507)  
Other operating expenses   (13,048)   (25,461)  
Total operating expenses   (18,247)   (36,496)  
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 64,000   64,000   $ 33,900
Income Statement:          
Total operating revenues 793,637 781,724 [1] 1,561,602 1,516,253  
Flying agreements | Previously Reported | ASU 2014-09          
Income Statement:          
Total operating revenues   791,341   1,536,752  
Flying agreements | Adjustments | ASU 2014-09          
Income Statement:          
Total operating revenues   (9,617)   (20,499)  
Airport customer service and other          
Income Statement:          
Total operating revenues 11,878 9,788 [1] 27,313 22,425  
Airport customer service and other | Previously Reported | ASU 2014-09          
Income Statement:          
Total operating revenues   18,418   38,422  
Airport customer service and other | Adjustments | ASU 2014-09          
Income Statement:          
Total operating revenues   (8,630)   (15,997)  
Aircraft fuel          
Income Statement:          
Other operating expenses   20,071   38,504  
Total operating expenses 25,890 28,949 [1] 55,197 60,897  
Aircraft fuel | Previously Reported | ASU 2014-09          
Income Statement:          
Other operating expenses   37,183   71,493  
Aircraft fuel | Adjustments | ASU 2014-09          
Income Statement:          
Other operating expenses   (17,112)   (32,989)  
Airport related expenses          
Income Statement:          
Other operating expenses   28,949   60,897  
Total operating expenses $ 30,011 20,071 [1] 56,950 38,504  
Airport related expenses | Previously Reported | ASU 2014-09          
Income Statement:          
Other operating expenses   15,902   35,436  
Airport related expenses | Adjustments | ASU 2014-09          
Income Statement:          
Other operating expenses   $ 13,047   25,461  
Up-front contract reimbursements          
Income Statement:          
Total operating revenues     $ 900 $ 700  
[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.