CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 227,982	$ 203,035
Marketable securities	276,577	286,668
Restricted cash	8,227	8,216
Income tax receivable	1,677	2,871
Receivables, net	62,380	62,162
Inventories, net	140,881	140,312
Prepaid aircraft rents	182,661	195,216
Deferred tax assets	114,834	100,730
Other current assets	12,799	18,360
Total current assets	1,028,018	1,017,570
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	5,528,654	5,242,790
Deposits on aircraft	38,150	38,150
Buildings and ground equipment	264,286	275,788
Total property and equipment, gross	5,831,090	5,556,728
Less-accumulated depreciation and amortization	(2,173,644)	(2,085,981)
Total property and equipment, net	3,657,446	3,470,747
OTHER ASSETS
Intangible assets, net	9,374	10,499
Non-current prepaid aircraft rents	250,239	229,180
Other assets	51,808	53,988
Total other assets	311,421	293,667
Total assets	4,996,885	4,781,984
CURRENT LIABILITIES:
Current maturities of long-term debt	276,901	268,667
Accounts payable	256,132	279,864
Accrued salaries, wages and benefits	143,272	138,291
Accrued aircraft rents	3,397	3,226
Taxes other than income taxes	18,019	17,176
Other current liabilities	43,069	40,802
Total current liabilities	740,790	748,026
OTHER LONG TERM LIABILITIES	52,469	56,191
LONG TERM DEBT, net of current maturities	1,762,916	1,659,234
DEFERRED INCOME TAXES PAYABLE	805,624	749,575
DEFERRED AIRCRAFT CREDITS	57,735	62,523
COMMITMENTS AND CONTINGENCIES (Note 6)
STOCKHOLDERS' EQUITY:
Preferred stock, 5,000,000 shares authorized; none issued
Common stock, no par value, 120,000,000 shares authorized; 79,496,217 and 79,020,371 shares issued, respectively	649,624	641,643
Retained earnings	1,337,849	1,275,142
Treasury stock, at cost, 28,015,386 and 28,015,386 shares, respectively	(410,090)	(410,090)
Accumulated other comprehensive loss	(32)	(260)
Total stockholders' equity	1,577,351	1,506,435
Total liabilities and stockholders' equity	$ 4,996,885	$ 4,781,984