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Consolidated Statements Of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash Flows from Operating Activities |  |  |
Net income | $ 249,624 | $ 268,550 | $ 319,466
Adjustments to reconcile net income to net cash provided by operations: |  |  |
Depreciation and amortization | 59,172 | 59,051 | 56,583
Stock option expense | 26,254 | 22,502 | 18,422
Deferred payroll taxes | (18,175) | (18,175) | 36,350
Provision for deferred income taxes | 14,827 | 2,400 | 1,433
Noncash portion of long-term incentive compensation | 6,188 | 7,745 | 7,208
(Payments) Litigation settlements |  | (9,440) |
Proceeds Litigation settlements | 4,000 |  | 2,684
Noncash directors' compensation | 1,170 | 1,173 | 1,171
Amortization of debt issuance costs | 342 | 306 | 306
Changes in operating assets and liabilities: |  |  |
(Increase)/decrease in accounts receivable | (2,414) | (8,431) | 12,773
(Increase)/decrease in inventories | (162) | (3,014) | 367
Decrease/(increase) in prepaid expenses | 2,397 | (6,511) | (3,027)
Increase in accounts payable and other current liabilities | 15,343 | 9,832 | 19,096
Change in current income taxes | (996) | (20,401) | 13,525
Net change in lease assets and liabilities | 1,471 | (44) | 1,206
Increase in other assets | (45,779) | (10,305) | (11,834)
(Decrease)/increase in other liabilities | (3,350) | 12,074 | 12,323
Other (uses)/sources | (26) | 1,285 | 1,237
Net cash provided by operating activities | 309,886 | 308,597 | 489,289
Cash Flows from Investing Activities |  |  |
Capital expenditures | (57,325) | (58,675) | (58,831)
Business combinations, net of cash acquired | (3,529) |  | (3,600)
Proceeds from sale of fixed assets | 2,330 | 904 | 1,693
Other (uses)/sources | (878) | 14 | (822)
Net cash used by investing activities | (59,402) | (57,757) | (61,560)
Cash Flows from Financing Activities |  |  |
Payments on revolving line of credit | (306,800) | (25,300) | (264,900)
Proceeds from revolving line of credit | 121,800 | 210,300 | 174,900
Proceeds from other long-term debt | 100,000 |  |
Payments on other long-term debt | (2,500) |  |
Purchases of treasury stock | (114,515) | (576,042) | (175,594)
Proceeds from exercise of stock options | 44,968 | 35,848 | 50,382
Dividends paid | (22,017) | (22,016) | (21,079)
Capital stock surrendered to pay taxes on stock-based compensation | (15,611) | (15,129) | (25,328)
Change in cash overdraft payable | (11,884) | 11,884 | (9,849)
Debt issuance costs | (1,586) |  |
Other (uses)/sources | (1,108) | (165) | 256
Net cash used by financing activities | (209,253) | (380,620) | (271,212)
Increase/(decrease) in cash and cash equivalents | 41,231 | (129,780) | 156,517
Cash and cash equivalents at beginning of year | 32,895 | 162,675 | 6,158
Cash and cash equivalents at end of year | $ 74,126 | $ 32,895 | $ 162,675

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