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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
 [1]
CURRENT ASSETS:    
Cash and cash equivalents $ 251,447 $ 181,792
Marketable securities 394,080 503,503
Income tax receivable 8,596 5,316
Receivables, net 61,327 42,731
Inventories, net 117,217 119,755
Prepaid aircraft rents 89,731 115,098
Other current assets 30,225 26,938
Total current assets 952,623 995,133
PROPERTY AND EQUIPMENT:    
Aircraft and rotable spares 5,583,624 5,335,870
Deposits on aircraft 49,000 49,000
Buildings and ground equipment 275,926 265,608
Total property and equipment, gross 5,908,550 5,650,478
Less-accumulated depreciation and amortization (1,533,346) (1,467,475)
Total property and equipment, net 4,375,204 4,183,003
OTHER ASSETS    
Long-term prepaid assets 203,178 230,923
Other assets 69,182 65,341
Total other assets 272,360 296,264
Total assets 5,600,187 5,474,400
CURRENT LIABILITIES:    
Current maturities of long-term debt 335,429 309,678
Accounts payable 290,140 288,904
Accrued salaries, wages and benefits 145,137 154,367
Taxes other than income taxes 16,570 19,228
Other current liabilities 50,542 48,648
Total current liabilities 837,818 820,825
OTHER LONG TERM LIABILITIES 62,363 58,662
LONG TERM DEBT, net of current maturities 2,440,771 2,377,346
DEFERRED INCOME TAXES PAYABLE 434,683 419,020
DEFERRED AIRCRAFT CREDITS 37,415 44,225
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; 81,104,752 and 80,398,104 shares issued, respectively 679,768 672,593
Retained earnings 1,566,114 1,516,957
Treasury stock, at cost, 29,058,982 and 28,643,535 shares, respectively (458,645) (435,178)
Accumulated other comprehensive loss (100) (50)
Total stockholders' equity 1,787,137 1,754,322
Total liabilities and stockholders' equity $ 5,600,187 $ 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.