CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 171,165	$ 132,275
Marketable securities	322,050	415,273
Restricted cash	11,584	11,582
Income tax receivable	1,378	2,779
Receivables, net	71,827	83,099
Inventories, net	139,671	137,452
Prepaid aircraft rents	437,193	397,850
Deferred tax assets	151,377	94,385
Other current assets	24,840	16,308
Total current assets	1,331,085	1,291,003
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	5,060,487	4,608,663
Deposits on aircraft	37,700	40,000
Buildings and ground equipment	282,606	274,900
Total property and equipment, gross	5,380,793	4,923,563
Less-accumulated depreciation and amortization	(1,975,389)	(1,902,375)
Total property and equipment, net	3,405,404	3,021,188
OTHER ASSETS
Intangible assets, net	11,623	12,748
Other assets	90,442	84,989
Total other assets	102,065	97,737
Total assets	4,838,554	4,409,928
CURRENT LIABILITIES:
Current maturities of long-term debt	263,725	211,821
Accounts payable	278,019	270,097
Accrued salaries, wages and benefits	138,302	138,902
Accrued aircraft rents	3,530	3,303
Taxes other than income taxes	20,598	17,457
Other current liabilities	40,544	42,775
Total current liabilities	744,718	684,355
OTHER LONG-TERM LIABILITIES	48,603	49,625
LONG-TERM DEBT, net of current maturities	1,800,452	1,533,990
DEFERRED INCOME TAXES PAYABLE	754,195	669,385
DEFERRED AIRCRAFT CREDITS	$ 67,373	$ 72,227
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Preferred stock, 5,000,000 shares authorized; none issued
Common stock, no par value, 120,000,000 shares authorized; 78,496,807 and 77,951,411 shares issued, respectively	$ 631,078	$ 626,521
Retained earnings	1,202,437	1,165,478
Treasury stock, at cost, 28,015,386 and 26,765,386 shares, respectively	(410,090)	(391,364)
Accumulated other comprehensive (loss)	(212)	(289)
Total stockholders' equity	1,423,213	1,400,346
Total liabilities and stockholders' equity	$ 4,838,554	$ 4,409,928