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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating activities |  |  |
Net income | $ 192 | $ 178 | $ 61
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 46 | 35 | 39
Stock-based compensation | 44 | 32 | 26
Deferred income taxes | 1 | (25) | 42
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 10 | (14) | 0
Unbilled revenue | (14) | (4) | (79)
Prepaid expenses | (9) | 28 | (45)
Accounts payable and other current liabilities | (8) | 23 | 11
Client deposits | 4 | (4) | (2)
Accrued wages | 23 | 26 | 73
Accrued health insurance costs | (16) | 22 | 16
Accrued workers' compensation costs | (7) | 9 | 60
Payroll taxes payable and other payroll withholdings | (305) | 294 | (175)
Other assets | (64) | (11) | 174
Other liabilities | (1) | 17 | (9)
Net cash (used in) provided by operating activities | (104) | 606 | 192
Investing activities |  |  |
Purchases of marketable securities | (258) | 0 | (15)
Proceeds from sale and maturity of marketable securities | 101 | 14 | 28
Acquisitions of property and equipment | (43) | (38) | (40)
Net cash used in investing activities | (200) | (24) | (27)
Financing activities |  |  |
Repurchase of common stock | (61) | (44) | (72)
Proceeds from issuance of common stock | 14 | 16 | 9
Awards effectively repurchased for required employee withholding taxes | (22) | (11) | (4)
Proceeds from issuance of debt, net | 210 | 0 | 58
Payments for extinguishment of debt | (204) | 0 | (58)
Repayment of debt | (22) | (38) | (37)
Net cash used in financing activities | (85) | (77) | (104)
Net (decrease) increase in unrestricted and restricted cash and cash equivalents | (389) | 505 | 61
Beginning of period | 1,738 | 1,233 | 1,172
End of period | 1,349 | 1,738 | 1,233
Supplemental disclosures of cash flow information |  |  |
Interest paid | 17 | 16 | 15
Income taxes paid, net | 49 | 2 | 39
Supplemental schedule of noncash investing and financing activities |  |  |
Payable for purchase of property and equipment | $ 3 | $ 2 | $ 1

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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=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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