CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 203,035	$ 132,275
Marketable securities	286,668	415,273
Restricted cash	8,216	11,582
Income tax receivable	2,871	2,779
Receivables, net	62,162	83,099
Inventories, net	140,312	137,452
Prepaid aircraft rents	195,216	196,348
Deferred tax assets	100,730	94,385
Other current assets	18,360	16,308
Total current assets	1,017,570	1,089,501
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	5,242,790	4,608,663
Deposits on aircraft	38,150	40,000
Buildings and ground equipment	275,788	274,900
Total property and equipment, gross	5,556,728	4,923,563
Less-accumulated depreciation and amortization	(2,085,981)	(1,902,375)
Total property and equipment, net	3,470,747	3,021,188
OTHER ASSETS
Intangible assets, net	10,499	12,748
Non-current prepaid aircraft rents	229,180	201,502
Other assets	74,890	84,989
Total other assets	314,569	299,239
Total assets	4,802,886	4,409,928
CURRENT LIABILITIES:
Current maturities of long-term debt	272,027	211,821
Accounts payable	279,864	270,097
Accrued salaries, wages and benefits	138,291	138,902
Accrued aircraft rents	3,226	3,303
Taxes other than income taxes	17,176	17,457
Other current liabilities	40,802	42,775
Total current liabilities	751,386	684,355
OTHER LONG-TERM LIABILITIES	56,191	49,625
LONG-TERM DEBT, net of current maturities	1,676,776	1,533,990
DEFERRED INCOME TAXES PAYABLE	749,575	669,385
DEFERRED AIRCRAFT CREDITS	$ 62,523	$ 72,227
COMMITMENTS AND CONTINGENCIES (Note 5)
STOCKHOLDERS' EQUITY:
Common stock, no par value, 120,000,000 shares authorized; 79,020,371 and 77,951,411 shares issued, respectively	$ 641,643	$ 626,521
Retained earnings	1,275,142	1,165,478
Treasury stock, at cost, 28,015,386 and 26,765,386 shares, respectively	(410,090)	(391,364)
Accumulated other comprehensive income (loss)	(260)	(289)
Total stockholders' equity	1,506,435	1,400,346
Total liabilities and stockholders' equity	$ 4,802,886	$ 4,409,928