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Consolidated Statements Of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash Flows from Operating Activities |  |  |  |
Net income | $ 272,509 | $ 249,624 | $ 268,550 |
Adjustments to reconcile net income to net cash provided by operations: |  |  |  |
Depreciation and amortization | 60,865 | 59,172 | 59,051 |
Stock option expense | 30,082 | 26,254 | 22,502 |
Deferred payroll taxes |  | (18,175) | (18,175) | $ 36,400
Noncash portion of long-term incentive compensation | 9,267 | 6,188 | 7,745 |
(Benefit)/provision for deferred income taxes | (8,027) | 14,827 | 2,400 |
Litigation settlements | 2,050 | 4,000 |  |
Litigation settlements |  |  | (9,440) |
Noncash directors' compensation | 1,444 | 1,170 | 1,173 |
Amortization of debt issuance costs | 580 | 342 | 306 |
Changes in operating assets and liabilities: |  |  |  |
Increase in accounts receivable | (41,488) | (2,414) | (8,431) |
Increase in inventories | (1,732) | (162) | (3,014) |
Decrease/(increase) in prepaid expenses | 87 | 2,397 | (6,511) |
(Decrease)/increase in accounts payable and other current liabilities | (9,348) | 15,343 | 9,832 |
Change in current income taxes | 11,748 | (996) | (20,401) |
Net change in lease assets and liabilities | (1,424) | 1,471 | (44) |
Increase in other assets | (9,952) | (45,779) | (10,305) |
Increase/(decrease) in other liabilities | 12,802 | (3,350) | 12,074 |
Other sources/(uses) | 836 | (26) | 1,285 |
Net cash provided by operating activities | 330,299 | 309,886 | 308,597 |
Cash Flows from Investing Activities |  |  |  |
Capital expenditures | (56,854) | (57,325) | (58,675) |
Business combinations, net of cash acquired | (3,994) | (3,529) |  |
Proceeds from sale of fixed assets | 640 | 2,330 | 904 |
Other (uses)/sources | (434) | (878) | 14 |
Net cash used by investing activities | (60,642) | (59,402) | (57,757) |
Cash Flows from Financing Activities |  |  |  |
Proceeds from exercise of stock options | 102,192 | 44,968 | 35,848 |
Payments on other long-term debt | (97,500) | (2,500) |  |
Proceeds from other long-term debt |  | 100,000 |  |
Purchases of treasury stock | (67,697) | (114,515) | (576,042) |
Dividends paid | (23,502) | (22,017) | (22,016) |
Change in cash overdrafts payable | 15,749 | (11,884) | 11,884 |
Capital stock surrendered to pay taxes on stock-based compensation | (9,557) | (15,611) | (15,129) |
Payments on revolving line of credit |  | (306,800) | (25,300) |
Proceeds from revolving line of credit |  | 121,800 | 210,300 |
Debt issuance costs |  | (1,586) |  |
Other sources/(uses) | 490 | (1,108) | (165) |
Net cash used by financing activities | (79,825) | (209,253) | (380,620) |
Increase/(decrease) in cash and cash equivalents | 189,832 | 41,231 | (129,780) |
Cash and cash equivalents at beginning of year | 74,126 | 32,895 | 162,675 |
Cash and cash equivalents at end of year | $ 263,958 | $ 74,126 | $ 32,895 | $ 162,675

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