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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities |  |
Net income | $ 110,758 | $ 68,848
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 16,335 | 13,355
Stock-based compensation | 14,656 | 16,390
Deferred income taxes | (591) | 5,820
Changes in operating assets and liabilities: |  |
Accounts receivable | (66,020) | (32,007)
Prepaid insurance | (2,973) | (3,937)
Other current assets | 2,717 | 266
Other assets | (1,760) | (3,195)
Accounts payable | (1,131) | (1,119)
Payroll taxes and other payroll deductions payable | (99,161) | (62,310)
Accrued worksite employee payroll expense | 72,713 | 41,488
Accrued health insurance costs | 7,383 | 8,183
Accrued workers’ compensation costs | 19,405 | 20,180
Accrued corporate payroll, commissions and other accrued liabilities | (11,887) | (7,639)
Income taxes payable/receivable | 9,885 | 4,071
Total adjustments | (40,429) | (454)
Net cash provided by operating activities | 70,329 | 68,394
Marketable securities: |  |
Purchases | (54,754) | (1,337)
Proceeds from dispositions | 16,299 | 0
Proceeds from maturities | 2,650 | 1,181
Property and equipment: |  |
Purchases | (21,519) | (26,518)
Net cash used in investing activities | (57,324) | (26,674)
Cash flows from financing activities: |  |
Purchase of treasury stock | (16,236) | (27,172)
Dividends paid | (25,170) | (17,831)
Other | 1,613 | 1,177
Net cash used in financing activities | (39,793) | (43,826)
Net decrease in cash, cash equivalents and restricted cash | (26,788) | (2,106)
Cash, cash equivalents and restricted cash beginning of period | 549,612 | 472,609
Cash, cash equivalents and restricted cash end of period | 522,824 | 470,503
Supplemental Cash Flow Information [Abstract] |  |
Cash and cash equivalents | 328,299 | 285,934
Restricted cash | 42,257 | 41,748
Deposits workers compensation | $ 152,268 | $ 142,821

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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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