Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 439,661	$ 339,581
Short-term investments	57,099	53,955
Trade accounts receivable, less allowance of $12,054 and $12,121	810,801	967,793
Other receivables, including advances to independent contractors, less allowance of $14,405 and $10,579	57,063	56,235
Other current assets	30,918	21,826
Total current assets	1,395,542	1,439,390
Operating property, less accumulated depreciation and amortization of $426,984 and $393,274	284,081	314,990
Goodwill	41,934	41,220
Other assets	130,970	136,279
Total assets	1,852,527	1,931,879
Current Liabilities
Cash overdraft	48,067	92,953
Accounts payable	464,720	527,372
Current maturities of long-term debt	29,210	36,175
Insurance claims	45,518	50,836
Dividends payable	0	71,854
Other current liabilities	82,550	98,945
Total current liabilities	670,065	878,135
Long-term debt, excluding current maturities	46,173	67,225
Insurance claims	56,776	58,268
Deferred income taxes and other noncurrent liabilities	36,359	41,030
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 68,497,324 and 68,382,310 shares	685	684
Additional paid-in capital	254,630	258,487
Retained earnings	2,808,919	2,635,960
Cost of 32,550,980 and 32,455,300 shares of common stock in treasury	(2,009,351)	(1,992,886)
Accumulated other comprehensive loss	(11,729)	(15,024)
Total shareholders' equity	1,043,154	887,221
Total liabilities and shareholders' equity	$ 1,852,527	$ 1,931,879