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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
CURRENT ASSETS: |  |
Cash and cash equivalents | $ 215,723 | $ 87,206
Marketable securities | 610,185 | 432,966
Income tax receivable | 3,916 | 11,141
Receivables, net | 34,462 | 82,977
Inventories, net | 91,196 | 110,503
Other current assets | 27,320 | 35,553
Total current assets | 982,802 | 760,346
PROPERTY AND EQUIPMENT: |  |
Aircraft and rotable spares | 7,527,555 | 7,078,801
Deposits on aircraft | 31,625 | 48,858
Buildings and ground equipment | 258,863 | 265,398
Total property and equipment, gross | 7,818,043 | 7,393,057
Less-accumulated depreciation and amortization | (2,455,995) | (1,998,376)
Total property and equipment, net | 5,362,048 | 5,394,681
OTHER ASSETS |  |
Operating lease right-of-use assets | 282,362 | 336,009
Other long-term assets | 260,410 | 166,093
Total other assets | 542,772 | 502,102
Total assets | 6,887,622 | 6,657,129
CURRENT LIABILITIES: |  |
Current maturities of long-term debt | 402,158 | 364,126
Accounts payable | 278,677 | 284,473
Accrued salaries, wages and benefits | 125,944 | 133,856
Current maturities of operating lease liabilities | 82,641 | 94,806
Taxes other than income taxes | 26,183 | 15,004
Other current liabilities | 26,119 | 32,411
Total current liabilities | 941,722 | 924,676
LONG-TERM DEBT, net of current maturities | 2,801,538 | 2,628,989
DEFERRED INCOME TAXES PAYABLE | 625,931 | 623,580
NONCURRENT OPERATING LEASE LIABILITIES | 205,845 | 259,237
OTHER LONG-TERM LIABILITIES | 173,041 | 45,633
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; 82,094,985 and 81,742,937 shares issued, respectively | 704,675 | 686,806
Retained earnings | 2,052,006 | 2,079,179
Treasury stock, at cost, 31,913,635 and 31,420,179 shares, respectively | (617,136) | (590,971)
Total stockholders' equity | 2,139,545 | 2,175,014
Total liabilities and stockholders' equity | $ 6,887,622 | $ 6,657,129

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