Statements Of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating revenues:
Passenger	$ 1,200,621	$ 1,169,338	$ 1,144,972
Non-ticket	1,121,335	972,125	786,608
Total operating revenues	2,321,956	2,141,463	1,931,580
Operating expenses:
Salaries, wages and benefits	472,471	377,508	313,409
Aircraft fuel	447,553	461,447	612,909
Aircraft rent	201,675	211,531	195,827
Landing fees and other rents	151,679	131,077	105,115
Depreciation and amortization	101,136	73,908	46,971
Maintenance, materials and repairs	98,587	80,448	73,956
Distribution	96,627	86,576	74,823
Special charges	37,189	673	45
Loss on disposal of assets	4,187	1,604	3,008
Other operating	267,191	207,569	150,254
Total operating expenses	1,878,295	1,632,341	1,576,317
Operating income	443,661	509,122	355,263
Other (income) expense:
Interest expense	41,654	20,382	2,747
Capitalized interest	(12,705)	(11,553)	(2,747)
Interest income	(5,276)	(2,125)	(336)
Other expense	528	15	2,605
Total other (income) expense	24,201	6,719	2,269
Income before income taxes	419,460	502,403	352,994
Provision for income taxes	154,581	185,183	127,530
Net income	$ 264,879	$ 317,220	$ 225,464
Basic earnings per share (in dollars per share)	$ 3.77	$ 4.39	$ 3.10
Diluted earnings per share (in dollars per share)	$ 3.76	$ 4.38	$ 3.08