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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS    
NET CASH PROVIDED BY OPERATING ACTIVITIES $ 165,895 $ 143,940
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of marketable securities (387,572) (455,990)
Sales of marketable securities 496,945 383,163
Proceeds from the sale of aircraft, property and equipment   36,512
Acquisition of property and equipment:    
Aircraft and rotable spare parts (198,777) (220,916)
Buildings and ground equipment (9,305) (479)
Aircraft deposits applied towards acquired aircraft   11,228
Increase in other assets (1,364) (2,425)
NET CASH USED IN INVESTING ACTIVITIES (100,073) (248,907)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of long-term debt 101,317 157,983
Principal payments on long-term debt (71,587) (88,104)
Net proceeds from issuance of common stock 2,320 1,481
Purchase of treasury stock and employee income tax paid on equity awards (23,467) (13,671)
Increase in debt issuance cost (610) (1,452)
Payment of cash dividends (4,140) (2,588)
NET CASH PROVIDED BY FINANCING ACTIVITIES 3,833 53,649
Increase (decrease) in cash and cash equivalents 69,655 (51,318)
Cash and cash equivalents at beginning of period 181,792 [1] 155,009
CASH AND CASH EQUIVALENTS AT END OF PERIOD 251,447 103,691
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Acquisition of rotable spare parts 574 1,704
Debt assumed on aircraft acquired off lease 59,132  
Cash paid during the period for:    
Interest, net of capitalized amounts 26,481 24,039
Income taxes $ 486 $ 478
[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.