Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 216,727	$ 462,564
Short-term investments	158,829	254,433
Customer receivables, less allowances of $11,100 and $9,855, respectively	630,370	567,474
Income taxes receivable	10,097	19,218
Other receivables	13,327	12,410
Prepaid expenses and other current assets	81,847	67,688
Total current assets	1,111,197	1,383,787
Property and equipment:
Revenue equipment	2,344,781	2,146,205
Land and structures	2,670,604	2,463,949
Other fixed assets	568,131	512,340
Leasehold improvements	13,506	13,131
Total property and equipment	5,597,022	5,135,625
Accumulated depreciation	(2,105,511)	(1,919,939)
Net property and equipment	3,491,511	3,215,686
Other assets	208,685	222,071
Total assets	4,811,393	4,821,544
Current liabilities:
Accounts payable	120,160	82,519
Compensation and benefits	293,688	257,905
Claims and insurance accruals	66,228	61,822
Other accrued liabilities	94,154	61,988
Income taxes payable	45,097
Current maturities of long-term debt	20,000
Total current liabilities	639,327	464,234
Long-term liabilities:
Long-term debt	79,959	99,947
Other non-current liabilities	265,553	328,838
Deferred income taxes	268,384	248,718
Total long-term liabilities	613,896	677,503
Total liabilities	1,253,223	1,141,737
Commitments and contingent liabilities
Shareholders' equity:
Common stock - $0.10 par value, 280,000,000 shares authorized, 110,954,501 and 115,011,172 shares outstanding at September 30, 2022 and December 31, 2021, respectively	11,095	11,501
Capital in excess of par value	240,790	174,445
Retained earnings	3,306,285	3,493,861
Total shareholders’ equity	3,558,170	3,679,807
Total liabilities and shareholders’ equity	$ 4,811,393	$ 4,821,544