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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
OPERATING REVENUES:    
Total operating revenues $ 783,400 $ 747,166 [1]
OPERATING EXPENSES:    
Salaries, wages and benefits 306,719 297,667 [1]
Depreciation and amortization 77,585 70,114 [1]
Other operating expenses 68,389 62,675 [1]
Total operating expenses 695,225 670,871 [1]
OPERATING INCOME 88,175 76,295 [1]
OTHER INCOME (EXPENSE):    
Interest income 1,705 660 [1]
Interest expense (26,234) (24,549) [1]
Other income 3,558  
Total other expense, net (20,971) (23,889) [1]
INCOME BEFORE INCOME TAXES 67,204 52,406 [1]
PROVISION FOR INCOME TAXES 12,842 17,620 [1]
NET INCOME $ 54,362 $ 34,786 [1]
BASIC EARNINGS PER SHARE (in dollars per share) $ 1.05 $ 0.67 [1]
DILUTED EARNINGS PER SHARE (in dollars per share) $ 1.03 $ 0.65 [1]
Weighted average common shares:    
Basic (in shares) 51,921 51,820 [1]
Diluted (in shares) 53,033 53,202 [1]
COMPREHENSIVE INCOME:    
Net income $ 54,362 $ 34,786 [1]
Net unrealized appreciation (depreciation) on marketable securities, net of taxes (50) 39 [1]
TOTAL COMPREHENSIVE INCOME 54,312 34,825 [1]
Flying agreements    
OPERATING REVENUES:    
Total operating revenues 767,964 734,529 [1]
Airport customer service and other    
OPERATING REVENUES:    
Total operating revenues 15,436 12,637 [1]
Aircraft maintenance, materials and repairs    
OPERATING EXPENSES:    
Total operating expenses 141,606 132,325 [1]
Aircraft rentals    
OPERATING REVENUES:    
Total operating revenues 189,068 198,463
OPERATING EXPENSES:    
Total operating expenses 44,680 57,709 [1]
Airport related expenses    
OPERATING EXPENSES:    
Other operating expenses   31,948
Total operating expenses 29,307 31,948 [1]
Aircraft fuel    
OPERATING EXPENSES:    
Other operating expenses   18,433
Total operating expenses $ 26,939 $ 18,433 [1]
[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.