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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
NET CASH PROVIDED BY OPERATING ACTIVITIES $ 244,167 $ 161,399
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of marketable securities (513,574) (469,956)
Sales of marketable securities 428,195 522,138
Proceeds from the sale of equipment 3,630 191
Acquisition of property and equipment:    
Aircraft and rotable spare parts (35,164) (91,522)
Deposits on aircraft   (13,500)
Buildings and ground equipment (3,341) (10,596)
Increase in other assets (739) (2,596)
NET CASH USED IN INVESTING ACTIVITIES (120,993) (65,841)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of long-term debt   38,227
Principal payments on long-term debt (113,502) (110,536)
Tax benefit from exercise of common stock options 206  
Return of deposits on aircraft and rotable spare parts   7,150
Net proceeds from issuance of common stock 4,076 4,444
Purchase of treasury stock (902) (56,166)
Payment of cash dividends (6,120) (6,417)
NET CASH USED IN FINANCING ACTIVITIES (116,242) (123,298)
Increase (decrease) in cash and cash equivalents 6,932 (27,740)
Cash and cash equivalents at beginning of period 129,526 112,338
CASH AND CASH EQUIVALENTS AT END OF PERIOD 136,458 84,598
Cash paid (received) during the year for:    
Interest, net of capitalized amounts 54,858 56,936
Income taxes $ (1,440) $ 332