Statement of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating revenues:
Passenger	$ 782,792	$ 689,650	$ 537,969
Non-ticket	535,596	381,536	243,296
Total operating revenue	1,318,388	1,071,186	781,265
Operating expenses:
Aircraft fuel	471,763	388,046	248,206
Salaries, wages and benefits	218,919	181,742	156,443
Aircraft rent	143,572	116,485	101,345
Landing fees and other rents	68,368	52,794	48,118
Distribution	56,668	51,349	41,179
Maintenance, materials and repairs	49,460	34,017	27,035
Depreciation and amortization	15,256	7,760	5,620
Other operating	127,886	91,172	83,748
Loss on disposal of assets	956	255	77
Special charges (credits)	(8,450)	3,184	621
Total operating expenses	1,144,398	926,804	712,392
Operating income	173,990	144,382	68,873
Other (income) expense:
Interest expense	1,350	24,781	50,313
Capitalized interest	(1,350)	(2,890)	(1,491)
Interest income	(925)	(575)	(328)
Other expense	331	235	194
Total other (income) expense	(594)	21,551	48,688
Income before income taxes	174,584	122,831	20,185
Provision for income taxes	66,124	46,383	(52,296)
Net income	$ 108,460	$ 76,448	$ 72,481
Net income per share, basic	$ 1.50	$ 1.44	$ 2.77
Net income per share, diluted	$ 1.49	$ 1.43	$ 2.72