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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
OPERATING ACTIVITIES |  |  |
Net income | $ 940,524 | $ 844,245 | $ 506,421
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 92,776 | 91,259 | 101,727
Provision for credit losses | (4,476) | 10,649 | 17,281
Stock-based compensation | 90,677 | 129,977 | 43,995
Deferred income taxes | (58,566) | (110,188) | (32,984)
Excess tax benefit on stock-based compensation | (13,662) | (13,101) | (17,581)
Other operating activities | (6,627) | 1,915 | 15,096
Changes in operating elements, net of effects of acquisitions: |  |  |
Receivables | 923,524 | (1,547,545) | (452,145)
Contract assets | 197,097 | (257,728) | (65,454)
Prepaid expenses and other | (28,495) | (43,819) | 27,237
Accounts payable and outstanding checks | (307,266) | 660,028 | 180,272
Accrued compensation | 42,266 | 63,912 | 22,547
Accrued transportation expense | (143,686) | 189,204 | 52,380
Accrued income taxes | (69,817) | 72,665 | 51,916
Other accrued liabilities | 2,371 | 1,607 | 26,503
Other assets and liabilities | (6,469) | 1,875 | 21,980
Net cash provided by operating activities | 1,650,171 | 94,955 | 499,191
INVESTING ACTIVITIES |  |  |
Purchases of property and equipment | (61,915) | (34,197) | (23,133)
Purchases and development of software | (66,582) | (36,725) | (30,876)
Acquisitions, net of cash acquired | 0 | (14,750) | (223,230)
Proceeds from sale of property and equipment | 63,579 | 0 | 5,525
Net cash used for investing activities | (64,918) | (85,672) | (271,714)
FINANCING ACTIVITIES |  |  |
Proceeds from stock issued for employee benefit plans | 100,059 | 70,669 | 107,657
Stock tendered for payment of withholding taxes | (28,388) | (26,720) | (17,854)
Repurchase of common stock | (1,459,900) | (581,756) | (177,514)
Cash dividends | (285,317) | (277,321) | (209,956)
Proceeds from long-term borrowings | 200,000 | 300,000 | 0
Payments on long-term borrowings | 0 | (2,048) | 0
Proceeds from short-term borrowings | 4,500,000 | 3,728,000 | 1,436,600
Payments on short-term borrowings | (4,646,000) | (3,203,251) | (1,579,600)
Net cash (used for) provided by financing activities | (1,619,546) | 7,573 | (440,667)
Effect of exchange rates on cash and cash equivalents | (5,638) | (3,239) | 9,128
Net change in cash and cash equivalents | (39,931) | 13,617 | (204,062)
Cash and cash equivalents, beginning of year | 257,413 | 243,796 | 447,858
Cash and cash equivalents, end of year | 217,482 | 257,413 | 243,796
Supplemental cash flow disclosures |  |  |
Cash paid for income taxes | 429,096 | 227,427 | 93,070
Cash paid for interest | 71,563 | 51,367 | 47,518
Accrued share repurchases held in other accrued liabilities | $ 1,106 | $ 4,293 | $ 5,231

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