Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Current assets:	$ 17,284	$ 46,983
Trade accounts receivable, net	1,160,371	1,224,166
Other receivables	199,767	257,774
Inventories	42,209	41,662
Prepaid expenses and other current assets	184,559	200,398
Total current assets	1,604,190	1,770,983
Property, Plant and Equipment [Abstract]
Revenue and service equipment	7,566,178	7,541,314
Land	312,576	269,222
Structures and improvements	592,825	533,425
Software, office equipment and furniture	876,791	804,967
Total property and equipment	9,348,370	9,148,928
Less accumulated depreciation	3,810,269	3,419,129
Net property and equipment	5,538,101	5,729,799
Goodwill	134,057	134,057
Other intangible assets, net	76,300	96,922
Other assets	574,507	580,509
Total assets	7,927,155	8,312,270
Liabilities, Current [Abstract]
Current portion of long-term debt	699,859	500,000
Trade accounts payable	655,604	645,925
Claims accruals	310,339	257,121
Accrued payroll and payroll taxes	110,388	122,477
Other accrued expenses	159,153	152,517
Total current liabilities	1,935,343	1,678,040
Long-term debt	766,938	977,702
Long-term claims accruals	444,479	368,704
Other long-term liabilities	307,005	377,070
Deferred income taxes	908,305	896,249
Total liabilities	4,362,070	4,297,765
Shareholders’ equity:
Preferred stock, $100 par value. 10 million shares authorized; none outstanding	0	0
Common stock, $.01 par value. 1 billion shares authorized; (167,099,432 shares issued at December 31, 2025 and 2024, of which 94,594,725 and 100,555,126 shares were outstanding at December 31, 2025 and 2024, respectively)	1,671	1,671
Additional paid-in capital	627,280	583,945
Retained earnings	7,800,696	7,373,462
Treasury stock, at cost (72,504,707 shares at December 31, 2025, and 66,544,306 shares at December 31, 2024)	(4,864,562)	(3,944,573)
Total shareholders’ equity	3,565,085	4,014,505
Total liabilities and shareholders' equity	$ 7,927,155	$ 8,312,270