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v3.19.1

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Operating activities |  |
Net income | $ 63 | $ 54
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 18 | 10
Stock-based compensation | 9 | 9
Changes in operating assets and liabilities: |  |
Accounts receivable | 1 | 13
Unbilled revenue | (9) | 11
Prepaid expenses | (12) | (11)
Other assets | (30) | (24)
Accounts payable and other current liabilities | 9 | (15)
Client deposits | (19) | (26)
Accrued wages | 17 | (15)
Accrued health insurance costs | 0 | (1)
Accrued workers' compensation costs | (2) | (3)
Payroll taxes payable and other payroll withholdings | (180) | (534)
Operating lease liabilities | (4) | 0
Other liabilities | (3) | (4)
Net cash used in operating activities | (142) | (536)
Investing activities |  |
Purchases of marketable securities | (30) | 0
Proceeds from sale and maturity of marketable securities | 31 | 14
Acquisitions of property and equipment | (12) | (12)
Net cash (used in) provided by investing activities | (11) | 2
Financing activities |  |
Repurchase of common stock | (38) | (8)
Proceeds from issuance of common stock | 1 | 3
Awards effectively repurchased for required employee withholding taxes | (4) | (4)
Repayment of debt | (6) | (10)
Net cash used in financing activities | (47) | (19)
Net decrease in unrestricted and restricted cash and cash equivalents | (200) | (553)
Cash and cash equivalents, unrestricted and restricted: |  |
Beginning of period | 1,349 | 1,738
End of period | 1,149 | 1,185
Supplemental disclosures of cash flow information |  |
Interest paid | 4 | 4
Income taxes paid, net | 1 | 0
Supplemental schedule of noncash investing and financing activities |  |
Payable for purchase of property and equipment | $ 5 | $ 2

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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
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration