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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 | $ 124,080 | $ 138,237 | $ 151,099
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 38,547 | 31,189 | 28,723
Amortization of marketable securities | 884 | 783 | (486)
Stock-based compensation | 40,623 | 60,145 | 23,993
Deferred income taxes | 4,711 | (5,647) | 4,860
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (120,560) | 73,033 | (65,156)
Prepaid insurance | (1,121) | 254 | (2,007)
Other current assets | (13,851) | 4,032 | (15,772)
Other assets and ROU assets | 4,356 | 15,725 | 9,722
Accounts payable | 209 | 1,638 | (6,057)
Payroll taxes and other payroll deductions payable | 89,932 | 100,712 | 16,082
Accrued worksite employee payroll expense | 74,817 | (67,023) | 71,880
Accrued health insurance costs | 17,316 | 11,505 | (13,973)
Accrued workers’ compensation costs | (197) | (3,052) | 13,247
Accrued corporate payroll, commissions and other accrued liabilities | 14,716 | (20,763) | (6,386)
Income taxes payable/receivable | (14,307) | 5,585 | (4,616)
Total adjustments | 136,075 | 208,116 | 54,054
Net cash provided by operating activities | 260,155 | 346,353 | 205,153
Marketable securities: |  |  |
Purchases | (58,202) | (50,624) | (110,131)
Proceeds from maturities | 60,045 | 49,635 | 108,380
Proceeds from dispositions | 0 | 484 | 28,313
Property and equipment: |  |  |
Purchases | (32,907) | (98,159) | (56,307)
Proceeds from dispositions | 51 | 43 | 21
Net cash used in investing activities | (31,013) | (98,621) | (29,724)
Cash flows from financing activities |  |  |
Purchase of treasury stock | 69,725 | 99,415 | 203,043
Dividends paid | (144,179) | (61,869) | (48,622)
Borrowings under long-term debt agreement | 0 | 100,000 | 125,000
Other | 5,831 | 7,701 | 8,312
Net cash used in financing activities | (208,073) | (53,583) | (118,353)
Net increase in cash and cash equivalents | 21,069 | 194,149 | 57,076
Cash, cash equivalents and restricted cash beginning of year | 786,699 | 592,550 | 535,474
Cash, cash equivalents and restricted cash at end of year | 807,768 | 786,699 | 592,550
Supplemental disclosures of cash flow information |  |  |
Income taxes, net | 53,835 | 51,097 | 38,299
Cash paid for interest | 7,268 | 8,977 | 7,421
ROU assets obtained in exchange for lease obligations | 19,572 | 22,770 | 24,474
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |
Cash and cash equivalents | 575,812 | 554,846 | 367,342
Restricted Cash and Cash Equivalents, Current | 46,929 | 45,522 | 49,295
Deposits workers' compensation | $ 185,027 | $ 186,331 | $ 175,913

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