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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
OPERATING ACTIVITIES    
Net income $ 618,533 $ 367,094
Adjustments to reconcile net income to net cash used for operating activities:    
Depreciation and amortization 45,748 46,215
Provision for credit losses (2,142) (36)
Stock-based compensation 52,535 53,150
Deferred income taxes (5,844) (2,474)
Excess tax benefit on stock-based compensation (7,553) (9,367)
Other operating activities (26,356) 933
Changes in operating elements, net of acquisitions:    
Receivables (378,641) (717,340)
Contract assets (65,362) (96,154)
Prepaid expenses and other (14,170) (38,971)
Accounts payable and outstanding checks 37,207 406,875
Accrued compensation (9,673) 12,115
Accrued transportation expense 62,506 73,167
Accrued income taxes (54,964) (4,431)
Other accrued liabilities 1,391 210
Other assets and liabilities (1,886) 1,612
Net cash provided by operating activities 251,329 92,598
INVESTING ACTIVITIES    
Purchases of property and equipment (36,781) (12,856)
Purchases and development of software (32,622) (16,981)
Acquisitions, net of cash acquired 0 14,749
Other investing activities 63,208 0
Net cash used for investing activities (6,195) (44,586)
FINANCING ACTIVITIES    
Proceeds from stock issued for employee benefit plans 53,574 36,674
Stock tendered for payment of withholding taxes (23,784) (23,083)
Repurchase of common stock (490,699) (262,904)
Cash dividends (145,268) (139,756)
Proceeds from long-term borrowings 200,000 0
Proceeds from short-term borrowings 2,735,000 1,661,000
Payments on short-term borrowings (2,586,000) (1,390,038)
Net cash used for financing activities (257,177) (118,107)
Effect of exchange rates on cash and cash equivalents (6,445) (898)
Net change in cash and cash equivalents (18,488) (70,993)
Cash and cash equivalents, beginning of period 257,413 243,796
Cash and cash equivalents, end of period $ 238,925 $ 172,803