CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 151,393	$ 170,636
Marketable securities	392,690	487,239
Restricted cash	11,582	12,219
Income tax receivable		840
Receivables, net	92,662	111,186
Inventories, net	150,133	138,094
Prepaid aircraft rents	381,046	360,781
Deferred tax assets	132,789	156,050
Other current assets	24,798	27,392
Total current assets	1,337,093	1,464,437
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	4,504,659	4,080,886
Deposits on aircraft	40,000	40,000
Buildings and ground equipment	283,350	279,965
Total property and equipment, gross	4,828,009	4,400,851
Less-accumulated depreciation and amortization	(1,869,304)	(1,749,058)
Total property and equipment, net	2,958,705	2,651,793
OTHER ASSETS
Intangible assets, net	13,311	14,998
Other assets	88,523	101,991
Total other assets	101,834	116,989
Total assets	4,397,632	4,233,219
CURRENT LIABILITIES:
Current maturities of long-term debt	202,067	177,389
Accounts payable	252,180	245,518
Accrued salaries, wages and benefits	133,744	133,002
Accrued aircraft rents	2,688	7,492
Taxes other than income taxes	23,477	19,626
Other current liabilities	45,755	37,437
Total current liabilities	659,911	620,464
OTHER LONG-TERM LIABILITIES	47,730	76,305
LONG-TERM DEBT, net of current maturities	1,467,506	1,293,179
DEFERRED INCOME TAXES PAYABLE	718,719	727,358
DEFERRED AIRCRAFT CREDITS	74,696	80,974
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Preferred stock, 5,000,000 shares authorized; none issued
Common stock, no par value, 120,000,000 shares authorized; 78,089,208 and 77,322,304 shares issued, respectively	624,810	618,511
Retained earnings	1,195,351	1,197,819
Treasury stock, at cost, 26,765,386 and 26,095,636 shares, respectively	(391,364)	(382,950)
Accumulated other comprehensive income	273	1,559
Total stockholders' equity	1,429,070	1,434,939
Total liabilities and stockholders' equity	$ 4,397,632	$ 4,233,219