CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 95,441	$ 146,766
Marketable securities	482,764	409,898
Restricted cash	8,250	8,243
Receivables, net	38,558	46,916
Inventories, net	119,608	118,509
Prepaid aircraft rents	147,289	162,360
Other current assets	24,676	25,100
Total current assets	916,586	917,792
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	5,002,597	4,839,501
Deposits on aircraft	27,572	38,800
Buildings and ground equipment	272,800	261,704
Total property and equipment, gross	5,302,969	5,140,005
Less-accumulated depreciation and amortization	(1,374,666)	(1,318,308)
Total property and equipment, net	3,928,303	3,821,697
OTHER ASSETS
Intangible assets, net	7,686	8,249
Long-term prepaid assets	232,090	218,505
Other assets	43,691	41,723
Total other assets	283,467	268,477
Total assets	5,128,356	5,007,966
CURRENT LIABILITIES:
Current maturities of long-term debt	293,644	305,460
Accounts payable	263,532	241,215
Accrued salaries, wages and benefits	133,086	139,885
Taxes other than income taxes	15,283	15,618
Other current liabilities	44,963	45,087
Total current liabilities	750,508	747,265
OTHER LONG TERM LIABILITIES	50,387	50,844
LONG TERM DEBT, net of current maturities	2,321,271	2,240,051
DEFERRED INCOME TAXES PAYABLE	581,203	565,404
DEFERRED AIRCRAFT CREDITS	51,172	53,459
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; 80,142,697 and 79,781,305 shares issued, respectively	662,343	657,353
Retained earnings	1,135,265	1,103,751
Treasury stock, at cost, 28,404,423 and 28,015,386 shares, respectively	(423,761)	(410,090)
Accumulated other comprehensive loss	(32)	(71)
Total stockholders' equity	1,373,815	1,350,943
Total liabilities and stockholders' equity	$ 5,128,356	$ 5,007,966