CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 246,765	$ 203,035
Marketable securities	187,323	286,668
Restricted cash	8,221	8,216
Income tax receivable	2,770	2,871
Receivables, net	80,053	62,162
Inventories, net	140,595	140,312
Prepaid aircraft rents	198,209	195,216
Deferred tax assets	102,804	100,730
Other current assets	17,951	18,360
Total current assets	984,691	1,017,570
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	5,325,637	5,242,790
Deposits on aircraft	38,150	38,150
Buildings and ground equipment	260,561	275,788
Total property and equipment, gross	5,624,348	5,556,728
Less-accumulated depreciation and amortization	(2,121,773)	(2,085,981)
Total property and equipment, net	3,502,575	3,470,747
OTHER ASSETS
Intangible assets, net	9,936	10,499
Non-current prepaid aircraft rents	261,599	229,180
Other assets	54,257	53,988
Total other assets	325,792	293,667
Total assets	4,813,058	4,781,984
CURRENT LIABILITIES:
Current maturities of long-term debt	274,325	268,667
Accounts payable	261,043	279,864
Accrued salaries, wages and benefits	131,561	138,291
Accrued aircraft rents	4,248	3,226
Taxes other than income taxes	15,234	17,176
Other current liabilities	42,972	40,802
Total current liabilities	729,383	748,026
OTHER LONG TERM LIABILITIES	54,283	56,191
LONG TERM DEBT, net of current maturities	1,664,766	1,659,234
DEFERRED INCOME TAXES PAYABLE	768,556	749,575
DEFERRED AIRCRAFT CREDITS	$ 60,169	$ 62,523
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; 79,388,758 and 79,020,371 shares issued, respectively	$ 645,908	$ 641,643
Retained earnings	1,300,179	1,275,142
Treasury stock, at cost, 28,015,386 and 28,015,386 shares, respectively	(410,090)	(410,090)
Accumulated other comprehensive loss	(96)	(260)
Total stockholders' equity	1,535,901	1,506,435
Total liabilities and stockholders' equity	$ 4,813,058	$ 4,781,984