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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities |  |
Net income | $ 130,704 | $ 110,758
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 20,929 | 16,335
Stock-based compensation | 20,813 | 14,656
Deferred income taxes | 8,659 | (591)
Changes in operating assets and liabilities: |  |
Accounts receivable | (83,267) | (66,020)
Prepaid insurance | (13,750) | (2,973)
Other current assets | 1,283 | 2,717
Other assets | (2,709) | (1,760)
Accounts payable | (5,249) | (1,131)
Payroll taxes and other payroll deductions payable | (80,549) | (99,161)
Accrued worksite employee payroll expense | 81,478 | 72,713
Accrued health insurance costs | (1,914) | 7,383
Accrued workers’ compensation costs | 6,087 | 19,405
Accrued corporate payroll, commissions and other accrued liabilities | (22,830) | (11,887)
Income taxes payable/receivable | (12,609) | 9,885
Total adjustments | (83,628) | (40,429)
Net cash provided by operating activities | 47,076 | 70,329
Marketable securities: |  |
Purchases | (90,909) | (54,754)
Proceeds from dispositions | 5,799 | 16,299
Proceeds from maturities | 85,480 | 2,650
Property and equipment: |  |
Purchases | (35,968) | (21,519)
Net cash used in investing activities | (35,598) | (57,324)
Cash flows from financing activities: |  |
Purchase of treasury stock | (153,668) | (16,236)
Dividends paid | (36,777) | (25,170)
Borrowings under revolving line of credit | 95,000 | 0
Other | (7,215) | (1,613)
Net cash used in financing activities | (88,230) | (39,793)
Net decrease in cash, cash equivalents and restricted cash | (76,752) | (26,788)
Cash, cash equivalents and restricted cash beginning of period | 535,474 | 549,612
Cash, cash equivalents and restricted cash end of period | 458,722 | 522,824
Supplemental Cash Flow Information [Abstract] |  |
Cash and cash equivalents | 243,439 | 328,299
Restricted cash | 45,251 | 42,257
Deposits workers compensation | 170,032 | 152,268
ROU assets obtained in exchange for lease obligations | $ 21,980 | $ 0

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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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