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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income | $ 45,863 | $ 98,682 | $ 64,581
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 14,667 | 14,268 | 13,940
Bad debt provision | 10,483 | 9,636 | 25,480
Deferred income tax benefit (expense) | 3,074 | (5,893) | (684)
Share-based compensation expense | 8,827 | 7,872 | 6,865
Amortization of premium on marketable securities | 2,275 | 1,822 | 1,434
Unrealized gain on deferred compensation fund investments | (6,397) | (9,390) | (7,257)
Loss on sale of assets | 1,469 | 1,335 | 0
Changes in operating assets and liabilities: |  |  |
Accounts and notes receivable | (37,185) | 46,158 | (29,532)
Inventories and supplies | 5,599 | 4,931 | 4,765
Prepaid expenses and other assets | (12,250) | (756) | 3,480
Deferred compensation funding | 6,661 | (52) | (738)
Accounts payable and other accrued expenses | 10,244 | (7,250) | (9,532)
Accrued payroll, accrued and withheld payroll taxes | (22,189) | 59,527 | 3,517
Income taxes receivable | (8,420) | (8,075) | 7,845
Accrued insurance claims | 6,966 | (5,194) | 8,482
Deferred compensation liability | 7,421 | 9,592 | 935
Net cash provided by operating activities | 37,108 | 217,213 | 93,581
Cash flows from investing activities: |  |  |
Disposals of fixed assets | 211 | 274 | 199
Additions to property and equipment | (5,687) | (4,341) | (4,368)
Purchases of marketable securities | (20,335) | (39,047) | (33,544)
Sales of marketable securities | 26,697 | 6,269 | 21,256
Cash paid for acquisitions | (23,876) | 0 | 0
Net cash used in investing activities | (22,990) | (36,845) | (16,457)
Cash flows from financing activities: |  |  |
Dividends paid | (62,226) | (60,705) | (58,951)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan | 92 | 93 | 90
Proceeds from the exercise of stock options | 2,425 | 2,920 | 3,628
Purchases of treasury stock | (21,535) | 0 | 0
Repayments of short-term borrowings, net | 0 | (10,000) | (20,000)
Payments of statutory withholding on net issuance of restricted stock units | (1,410) | (675) | (587)
Net cash used in financing activities | (82,654) | (68,367) | (75,820)
Net change in cash and cash equivalents | (68,536) | 112,001 | 1,304
Cash and cash equivalents at beginning of the period | 139,330 | 27,329 | 26,025
Cash and cash equivalents at end of the period | 70,794 | 139,330 | 27,329
Supplementary cash flow information: |  |  |
Cash paid for interest | 1,385 | 1,374 | 3,459
Cash paid for income taxes, net of refunds | 21,233 | 44,865 | 20,026
Contingent shares settled pursuant to acquisition | 0 | 0 | 1,012
Accrued variable consideration for acquisition of businesses | $ 10,456 | $ 0 | $ 0

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