CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 98,085	$ 146,766
Marketable securities	569,080	409,898
Restricted cash	8,278	8,243
Receivables, net	40,337	46,916
Inventories, net	121,235	118,509
Prepaid aircraft rents	126,693	162,360
Other current assets	30,424	25,100
Total current assets	994,132	917,792
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	5,252,416	4,839,501
Deposits on aircraft	49,000	38,800
Buildings and ground equipment	246,055	261,704
Total property and equipment, gross	5,547,471	5,140,005
Less-accumulated depreciation and amortization	(1,405,207)	(1,318,308)
Total property and equipment, net	4,142,264	3,821,697
OTHER ASSETS
Intangible assets, net	6,121	8,249
Long-term prepaid assets	204,457	218,505
Other assets	42,472	41,723
Total other assets	253,050	268,477
Total assets	5,389,446	5,007,966
CURRENT LIABILITIES:
Current maturities of long-term debt	303,423	305,460
Accounts payable	276,307	241,215
Accrued salaries, wages and benefits	149,881	139,885
Taxes other than income taxes	23,883	15,618
Other current liabilities	45,640	45,087
Total current liabilities	799,134	747,265
OTHER LONG TERM LIABILITIES	46,574	50,844
LONG TERM DEBT, net of current maturities	2,380,792	2,240,051
DEFERRED INCOME TAXES PAYABLE	640,685	565,404
DEFERRED AIRCRAFT CREDITS	46,546	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; 80,266,365 and 79,781,305 shares issued, respectively	668,970	657,353
Retained earnings	1,231,169	1,103,751
Treasury stock, at cost, 28,423,779 and 28,015,386 shares, respectively	(424,420)	(410,090)
Accumulated other comprehensive loss	(4)	(71)
Total stockholders' equity	1,475,715	1,350,943
Total liabilities and stockholders' equity	$ 5,389,446	$ 5,007,966