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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Operating activities |  |
Net income | $ 109 | $ 112
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 27 | 24
Noncash lease expense | 10 | 0
Stock-based compensation | 20 | 19
Changes in operating assets and liabilities: |  |
Accounts receivable | 3 | 11
Unbilled revenue | (36) | 35
Prepaid expenses | 18 | 9
Other assets | (30) | (45)
Accounts payable and other current liabilities | (11) | (28)
Client deposits | 10 | (24)
Accrued wages | 25 | (28)
Accrued health insurance costs | (13) | (13)
Accrued workers' compensation costs | 9 | (8)
Payroll taxes payable and other payroll withholdings | (256) | (588)
Operating lease liabilities | (9) | 0
Other liabilities | (2) | (1)
Net cash used in operating activities | (162) | (543)
Investing activities |  |
Purchases of marketable securities | (65) | (203)
Proceeds from sale and maturity of marketable securities | 65 | 63
Acquisitions of property and equipment | (25) | (26)
Net cash used in investing activities | (25) | (166)
Financing activities |  |
Repurchase of common stock | (62) | (30)
Proceeds from issuance of common stock from employee stock purchase plan | 4 | 3
Proceeds from issuance of common stock from exercised options | 2 | 5
Awards effectively repurchased for required employee withholding taxes | (10) | (10)
Proceeds from issuance of notes payable, net | 0 | 210
Payments for extinguishment of debt | 0 | (204)
Repayment of debt | (11) | (10)
Net cash used in financing activities | (77) | (36)
Net decrease in unrestricted and restricted cash and cash equivalents | (264) | (745)
Cash and cash equivalents, unrestricted and restricted: |  |
Beginning of period | 1,349 | 1,738
End of period | 1,085 | 993
Supplemental disclosures of cash flow information |  |
Interest paid | 9 | 8
Income taxes paid, net | 33 | 24
Supplemental schedule of noncash investing and financing activities |  |
Payable for purchase of property and equipment | $ 8 | $ 2

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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 http://asc.fasb.org/extlink&oid=118932676&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=118932676&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 http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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