CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 143,448	$ 146,766
Marketable securities	482,809	409,898
Restricted cash	8,262	8,243
Receivables, net	38,017	46,916
Inventories, net	118,476	118,509
Prepaid aircraft rents	137,692	162,360
Other current assets	18,305	25,100
Total current assets	947,009	917,792
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	5,202,929	4,839,501
Deposits on aircraft	21,976	38,800
Buildings and ground equipment	271,450	261,704
Total property and equipment, gross	5,496,355	5,140,005
Less-accumulated depreciation and amortization	(1,361,838)	(1,318,308)
Total property and equipment, net	4,134,517	3,821,697
OTHER ASSETS
Intangible assets, net	7,124	8,249
Long-term prepaid assets	227,427	218,505
Other assets	44,536	41,723
Total other assets	279,087	268,477
Total assets	5,360,613	5,007,966
CURRENT LIABILITIES:
Current portion of long-term debt, net of debt issue costs	306,849	305,460
Accounts payable	265,028	241,215
Accrued salaries, wages and benefits	146,083	139,885
Taxes other than income taxes	17,105	15,618
Other current liabilities	44,025	45,087
Total current liabilities	779,090	747,265
OTHER LONG TERM LIABILITIES	47,559	50,844
LONG TERM DEBT, net of current maturities	2,452,663	2,240,051
DEFERRED INCOME TAXES PAYABLE	609,957	565,404
DEFERRED AIRCRAFT CREDITS	48,802	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; 80,176,705 and 79,781,305 shares issued, respectively	664,917	657,353
Retained earnings	1,181,601	1,103,751
Treasury stock, at cost, 28,410,609 and 28,015,386 shares, respectively	(423,961)	(410,090)
Accumulated other comprehensive loss	(15)	(71)
Total stockholders' equity	1,422,542	1,350,943
Total liabilities and stockholders' equity	$ 5,360,613	$ 5,007,966