Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating revenues:
Passenger	$ 986,018	$ 782,792	$ 689,650
Non-ticket	668,367	535,596	381,536
Total operating revenues	1,654,385	1,318,388	1,071,186
Operating expenses:
Aircraft fuel	551,746	471,763	388,046
Salaries, wages and benefits	262,150	218,919	181,742
Aircraft rent	169,737	143,572	116,485
Landing fees and other rents	83,604	68,368	52,794
Distribution	67,481	56,668	51,349
Maintenance, materials and repairs	60,143	49,460	34,017
Depreciation and amortization	31,947	15,256	7,760
Other operating	144,586	127,886	91,172
Loss on disposal of assets	525	956	255
Special charges (credits)	174	(8,450)	3,184
Total operating expenses	1,372,093	1,144,398	926,804
Operating income	282,292	173,990	144,382
Other (income) expense:
Interest expense	214	1,350	24,781
Capitalized interest	(214)	(1,350)	(2,890)
Interest income	(401)	(925)	(575)
Other expense	283	331	235
Total other (income) expense	(118)	(594)	21,551
Income before income taxes	282,410	174,584	122,831
Provision for income taxes	105,492	66,124	46,383
Net income	$ 176,918	$ 108,460	$ 76,448
Basic earnings per share (in dollars per share)	$ 2.44	$ 1.50	$ 1.44
Diluted earnings per share (in dollars per share)	$ 2.42	$ 1.49	$ 1.43