CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 146,766	$ 203,035
Marketable securities	409,898	286,668
Restricted cash	8,243	8,216
Income tax receivable	6,989	2,871
Receivables, net	46,916	62,162
Inventories, net	118,509	140,312
Prepaid aircraft rents	162,360	195,216
Deferred tax assets	129,285	100,730
Other current assets	18,111	18,360
Total current assets	1,047,077	1,017,570
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	4,839,501	5,242,790
Deposits on aircraft	38,800	38,150
Buildings and ground equipment	261,704	275,788
Total property and equipment, gross	5,140,005	5,556,728
Less-accumulated depreciation and amortization	(1,318,308)	(2,085,981)
Total property and equipment, net	3,821,697	3,470,747
OTHER ASSETS
Intangible assets, net	8,249	10,499
Long-term prepaid assets	218,505	229,180
Other assets	41,723	53,988
Total other assets	268,477	293,667
Total assets	5,137,251	4,781,984
CURRENT LIABILITIES:
Current maturities of long-term debt	305,460	268,667
Accounts payable	241,215	279,864
Accrued salaries, wages and benefits	139,885	138,291
Taxes other than income taxes	15,618	17,176
Other current liabilities	45,087	44,028
Total current liabilities	747,265	748,026
OTHER LONG TERM LIABILITIES	50,844	56,191
LONG TERM DEBT, net of current maturities	2,240,051	1,659,234
DEFERRED INCOME TAXES PAYABLE	694,689	749,575
DEFERRED AIRCRAFT CREDITS	53,459	62,523
COMMITMENTS AND CONTINGENCIES (Note 5)
STOCKHOLDERS' EQUITY:
Preferred stock, 5,000,000 shares authorized; none issued
Common stock, no par value, 120,000,000 shares authorized; 79,781,305 and 79,020,371 shares issued, respectively	657,353	641,643
Retained earnings	1,103,751	1,275,142
Treasury stock, at cost, 28,015,386 and 28,015,386 shares, respectively	(410,090)	(410,090)
Accumulated other comprehensive loss	(71)	(260)
Total stockholders' equity	1,350,943	1,506,435
Total liabilities and stockholders' equity	$ 5,137,251	$ 4,781,984