CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	[1]
CURRENT ASSETS:
Cash and cash equivalents	$ 324,561	$ 181,792
Marketable Securities	380,242	503,503
Income tax receivable	18,118	5,316
Receivables, net	62,233	42,731
Inventories, net	124,037	119,755
Prepaid aircraft rents	89,839	115,098
Other current assets	53,042	26,938
Total current assets	1,052,072	995,133
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	6,229,941	5,335,870
Deposits on aircraft	27,579	49,000
Buildings and ground equipment	297,862	265,608
Total property and equipment, gross	6,555,382	5,650,478
Less-accumulated depreciation and amortization	(1,680,115)	(1,467,475)
Total property and equipment, net	4,875,267	4,183,003
OTHER ASSETS:
Long-term prepaid assets	189,357	230,923
Other assets	68,164	65,341
Total other assets	257,521	296,264
Total assets	6,184,860	5,474,400
CURRENT LIABILITIES:
Current maturities of long-term debt	357,327	309,678
Accounts payable	320,432	288,904
Accrued salaries, wages and benefits	150,881	154,367
Taxes other than income taxes	21,618	19,228
Other current liabilities	63,187	48,648
Total current liabilities	913,445	820,825
LONG TERM DEBT, net of current maturities	2,751,722	2,377,346
DEFERRED INCOME TAXES PAYABLE	493,562	419,020
DEFERRED AIRCRAFT CREDITS	34,580	44,225
OTHER LONG TERM LIABILITIES	62,678	58,662
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; 81,239,194 and 80,398,104 shares issued, respectively	688,168	672,593
Retained earnings	1,714,621	1,516,957
Treasury stock, at cost, 29,310,836 and 28,643,535 shares, respectively	(473,898)	(435,178)
Accumulated other comprehensive loss	(18)	(50)
Total stockholders' equity	1,928,873	1,754,322
Total liabilities and stockholders' equity	$ 6,184,860	$ 5,474,400

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.