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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
OPERATING ACTIVITIES    
Net income $ 114,891 $ 270,348
Adjustments to reconcile net income to net cash used for operating activities:    
Depreciation and amortization 24,380 22,486
Provision for credit losses (6,637) 1,672
Stock-based compensation 15,607 24,606
Deferred income taxes (10,272) (2,916)
Excess tax benefit on stock-based compensation (7,011) (4,965)
Other operating activities 942 42
Changes in operating elements, net of acquisitions:    
Receivables 326,244 (424,025)
Contract assets 66,124 (51,439)
Prepaid expenses and other 433 (11,924)
Accounts payable and outstanding checks (90,724) 143,980
Accrued compensation (134,795) (79,885)
Accrued transportation expense (53,882) 42,825
Accrued income taxes (40) 48,502
Other accrued liabilities 8,169 8,099
Other assets and liabilities 1,115 (1,334)
Net cash provided by (used for) operating activities 254,544 (13,928)
INVESTING ACTIVITIES    
Purchases of property and equipment (11,371) (10,046)
Purchases and development of software (15,579) (16,183)
Proceeds from sale of property and equipment 0 2,250
Net cash used for investing activities (26,950) (23,979)
FINANCING ACTIVITIES    
Proceeds from stock issued for employee benefit plans 19,673 25,366
Stock tendered for payment of withholding taxes (20,048) (16,462)
Repurchase of common stock (31,182) (161,279)
Cash dividends (73,435) (72,855)
Proceeds from long-term borrowings 0 200,000
Proceeds from short-term borrowings 739,000 1,062,000
Payments on short-term borrowings (840,000) (1,015,000)
Net cash (used for) provided by financing activities (205,992) 21,770
Effect of exchange rates on cash and cash equivalents 76 1,533
Net change in cash and cash equivalents 21,678 (14,604)
Cash and cash equivalents, beginning of period 217,482 257,413
Cash and cash equivalents, end of period $ 239,160 $ 242,809