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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Operating activities |  |
Net income | $ 163 | $ 112
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 36 | 26
Stock-based compensation | 31 | 21
Changes in operating assets and liabilities: |  |
Prepaid income taxes | 1 | 42
Prepaid expenses and other current assets | (24) | (1)
Workers' compensation collateral receivable and other noncurrent assets | (10) | (7)
Accounts payable and other current liabilities | (9) | 7
Accrued corporate wages | (4) | 1
Workers' compensation loss reserves and other noncurrent liabilities | 0 | 4
Worksite employee related assets | (51) | (5)
Worksite employee related liabilities | (609) | (341)
Net cash used in operating activities | (476) | (141)
Investing activities |  |
Purchases of marketable securities | (223) | 0
Proceeds from sale of marketable securities | 54 | 0
Proceeds from maturity of marketable securities | 33 | 14
Acquisitions of property and equipment | (33) | (29)
Net cash used in investing activities | (169) | (15)
Financing activities |  |
Repurchase of common stock | (47) | (39)
Proceeds from issuance of common stock on exercised options | 6 | 9
Proceeds from issuance of common stock on employee stock purchase plan | 3 | 2
Awards effectively repurchased for required employee withholding taxes | (15) | (8)
Proceeds from issuance of notes payable, net | 210 | 0
Payments for extinguishment of debt | (204) | 0
Repayment of notes payable | (15) | (29)
Net cash used in financing activities | (62) | (65)
Net decrease in cash and cash equivalents, unrestricted and restricted | (707) | (221)
Cash and cash equivalents, unrestricted and restricted: |  |
Beginning of period | 1,738 | 1,233
End of period | 1,031 | 1,012
Supplemental disclosures of cash flow information |  |
Interest paid | 13 | 12
Income taxes paid, net | 33 | 0
Supplemental schedule of noncash investing and financing activities |  |
Payable for purchase of property and equipment | 2 | 2
Supplemental schedule of cash and cash equivalents |  |
Net increase (decrease) in unrestricted cash and cash equivalents | (99) | 80
Net decrease in restricted cash and cash equivalents | $ 608 | $ 301

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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow to pay off borrowing used to receive debt funding on a regular basis with maturities ranging from 5-10 years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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