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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities |  |
Net income | $ 114,372 | $ 133,952
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 27,715 | 23,329
Stock-based compensation | 35,965 | 38,110
Deferred income taxes | 7,950 | 6,757
Changes in operating assets and liabilities: |  |
Accounts receivable | (186,757) | (62,933)
Prepaid insurance | (9,493) | (24,341)
Other current assets | (13,832) | 9,721
Other assets and ROU assets | (4,153) | (10,862)
Accounts payable | (1,953) | 1,451
Payroll taxes and other payroll deductions payable | (145,098) | (99,196)
Accrued worksite employee payroll expense | 200,054 | 69,937
Accrued health insurance costs | 7,681 | 23,459
Accrued workers’ compensation costs | (864) | (2,273)
Accrued corporate payroll, commissions and other accrued liabilities | 22,428 | (32,238)
Income taxes payable/receivable | (7,478) | 9,977
Total adjustments | (59,529) | (27,378)
Net cash provided by operating activities | 54,843 | 106,574
Marketable securities: |  |
Purchases | (41,413) | (42,007)
Proceeds from dispositions | 0 | 484
Proceeds from maturities | 42,600 | 41,860
Property and equipment: |  |
Purchases | (23,603) | (68,770)
Net cash used in investing activities | (22,416) | (68,433)
Cash flows from financing activities: |  |
Purchase of treasury stock | (49,770) | (91,216)
Dividends paid | (50,198) | (46,522)
Borrowings under revolving line of credit | 0 | 100,000
Other | (4,812) | (6,302)
Net cash used in financing activities | (95,156) | (31,436)
Net increase (decrease) in cash, cash equivalents and restricted cash | (62,729) | 6,705
Cash, cash equivalents and restricted cash beginning of period | 786,699 | 592,550
Cash, cash equivalents and restricted cash end of period | 723,970 | 599,255
Supplemental Cash Flow Information [Abstract] |  |
Cash and cash equivalents | 467,921 | 372,356
Restricted cash | 47,813 | 45,265
Deposits workers compensation | 208,236 | 181,634
ROU assets obtained in exchange for lease obligations | $ 16,275 | $ 18,364

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