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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities |  |  |
Net income | $ 138,237 | $ 151,099 | $ 135,413
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 31,189 | 28,723 | 22,842
Amortization of marketable securities | 783 | (486) | 137
Stock-based compensation | 60,145 | 23,993 | 20,425
Deferred income taxes | (5,647) | 4,860 | (4,533)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 73,033 | (65,156) | (66,642)
Prepaid insurance | 254 | (2,007) | 2,371
Other current assets | 4,032 | (15,772) | (730)
Other assets and ROU assets | 15,725 | 9,722 | (2,005)
Accounts payable | 1,638 | (6,057) | 4,175
Payroll taxes and other payroll deductions payable | 100,712 | 16,082 | (42,081)
Accrued worksite employee payroll expense | (67,023) | 71,880 | 62,577
Accrued health insurance costs | 11,505 | (13,973) | 9,078
Accrued workers’ compensation costs | (3,052) | 13,247 | 23,763
Accrued corporate payroll, commissions and other accrued liabilities | (20,763) | (6,386) | 8,941
Income taxes payable/receivable | 5,585 | (4,616) | 10,749
Total adjustments | 208,116 | 54,054 | 49,067
Net cash provided by operating activities | 346,353 | 205,153 | 184,480
Marketable securities: |  |  |
Purchases | (50,624) | (110,131) | (87,887)
Proceeds from maturities | 49,635 | 108,380 | 12,625
Proceeds from dispositions | 484 | 28,313 | 16,299
Property and equipment: |  |  |
Purchases | (98,159) | (56,307) | (35,328)
Proceeds from dispositions | 43 | 21 | 151
Net cash used in investing activities | (98,621) | (29,724) | (94,140)
Cash flows from financing activities |  |  |
Purchase of treasury stock | 99,415 | 203,043 | 113,327
Dividends paid | (61,869) | (48,622) | (33,408)
Borrowings under long-term debt agreement | 100,000 | 125,000 | 40,000
Other | 7,701 | 8,312 | 2,257
Net cash used in financing activities | (53,583) | (118,353) | (104,478)
Net increase (decrease) in cash and cash equivalents | 194,149 | 57,076 | (14,138)
Cash, cash equivalents and restricted cash beginning of year | 592,550 | 535,474 | 549,612
Cash, cash equivalents and restricted cash at end of year | 786,699 | 592,550 | 535,474
Supplemental disclosures of cash flow information |  |  |
Income taxes, net | 51,097 | 38,299 | 40,730
Cash paid for interest | 8,977 | 7,421 | 4,006
ROU assets obtained in exchange for lease obligations | 22,770 | 24,474 | 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |
Cash and cash equivalents | 554,846 | 367,342 | 326,773
Restricted Cash and Cash Equivalents, Current | 45,522 | 49,295 | 42,227
Deposits workers' compensation | $ 186,331 | $ 175,913 | $ 166,474

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