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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Operating activities |  |
Net income | $ 230 | $ 192
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 46 | 45
Stock based compensation | 30 | 24
Amortization of ROU asset, lease modification and impairment | 6 | 6
Other | 3 | 2
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 8 | 10
Unbilled revenue, net | 16 | (100)
Other assets and prepaid expenses, net | (17) | (37)
Accounts payable and other liabilities | 2 | 26
Client deposits and other client liabilities | (23) | (2)
Accrued wages | 196 | 197
Accrued health insurance costs, net | (23) | (17)
Accrued workers' compensation costs, net | (9) | (7)
Payroll taxes payable and other payroll withholdings | (332) | (523)
Operating lease liabilities | (8) | (6)
Net cash provided by (used in) operating activities | 125 | (190)
Investing activities |  |
Purchases of marketable securities | (157) | (267)
Proceeds from sale and maturity of marketable securities | 175 | 149
Purchases of property and equipment | (26) | (17)
Acquisition of Zenefits, net of cash acquired | (183) | 0
Net cash used in investing activities | (191) | (135)
Financing activities |  |
Repurchase of common stock | (382) | (74)
Proceeds from issuance of common stock | 5 | 5
Awards effectively repurchased for required employee withholding taxes | (8) | (9)
Payment of long-term financing fees and debt issuance costs | 0 | (9)
Proceeds from issuance of 2029 Notes | 0 | 500
Repayment of debt | 0 | (370)
Net cash provided by (used in) financing activities | (385) | 43
Net decrease in cash and cash equivalents, unrestricted and restricted | (451) | (282)
Cash and cash equivalents, unrestricted and restricted: |  |
Beginning of period | 1,738 | 1,643
End of period | 1,287 | 1,361
Supplemental disclosures of cash flow information |  |
Interest paid | 9 | 2
Income taxes (refund) paid, net | $ 37 | $ 45

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- Definition The cash inflow from a borrowing supported by a written promise to pay an obligation. + 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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + 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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + 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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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