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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
OPERATING ACTIVITIES    
Net income $ 212,207 $ 618,533
Adjustments to reconcile net income to net cash used for operating activities:    
Depreciation and amortization 50,355 45,748
Provision for credit losses (8,397) (2,142)
Stock-based compensation 21,642 52,535
Deferred income taxes (21,825) (5,844)
Excess tax benefit on stock-based compensation (8,645) (7,553)
Other operating activities 3,080 (26,356)
Changes in operating elements, net of acquisitions:    
Receivables 501,210 (378,641)
Contract assets 69,662 (65,362)
Prepaid expenses and other (23,834) (14,170)
Accounts payable and outstanding checks (125,090) 37,207
Accrued compensation (130,197) (9,673)
Accrued transportation expense (56,524) 62,506
Accrued income taxes 3,308 (54,964)
Other accrued liabilities (9,611) 1,391
Other assets and liabilities 2,035 (1,886)
Net cash provided by operating activities 479,376 251,329
INVESTING ACTIVITIES    
Purchases of property and equipment (21,679) (36,781)
Purchases and development of software (29,622) (32,622)
Proceeds from sale of property and equipment 0 63,208
Net cash used for investing activities (51,301) (6,195)
FINANCING ACTIVITIES    
Proceeds from stock issued for employee benefit plans 36,684 53,574
Stock tendered for payment of withholding taxes (21,853) (23,784)
Repurchase of common stock (62,754) (490,699)
Cash dividends (146,195) (145,268)
Proceeds from long-term borrowings 0 200,000
Proceeds from short-term borrowings 1,861,750 2,735,000
Payments on short-term borrowings (2,099,750) (2,586,000)
Net cash used for financing activities (432,118) (257,177)
Effect of exchange rates on cash and cash equivalents (3,284) (6,445)
Net change in cash and cash equivalents (7,327) (18,488)
Cash and cash equivalents, beginning of period 217,482 257,413
Cash and cash equivalents, end of period $ 210,155 $ 238,925