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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating activities      
Net income $ 212 $ 192 $ 178
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 57 46 35
Noncash lease expense 16 0 0
Stock-based compensation 41 44 32
Deferred income taxes (7) 1 (25)
Amortization of (premium) discount of investments (1) 0 0
Changes in operating assets and liabilities:      
Accounts receivable, net 5 10 (14)
Unbilled revenue, net 19 (14) (4)
Prepaid expenses, net (5) (9) 28
Accounts payable and other current liabilities (15) (8) 23
Client deposits (12) 4 (4)
Accrued wages 40 23 26
Accrued health insurance costs, net 32 (16) 22
Accrued workers' compensation costs, net (20) (7) 9
Payroll taxes payable and other payroll withholdings 172 (305) 294
Operating lease liabilities (17) 0 0
Other assets (34) (64) (11)
Other liabilities (12) (1) 17
Net cash (used in) provided by operating activities 471 (104) 606
Investing activities      
Purchases of marketable securities (302) (258) 0
Proceeds from sale and maturity of marketable securities 159 101 14
Acquisitions of property and equipment (45) (43) (38)
Net cash used in investing activities (188) (200) (24)
Financing activities      
Repurchase of common stock (140) (61) (44)
Proceeds from issuance of common stock 11 14 16
Awards effectively repurchased for required employee withholding taxes (25) (22) (11)
Proceeds from issuance of notes payable, net 0 210 0
Payments for extinguishment of debt 0 (204) 0
Repayment of debt (22) (22) (38)
Net cash used in financing activities (176) (85) (77)
Net (decrease) increase in cash and cash equivalents, unrestricted and restricted 107 (389) 505
Beginning of period 1,349 1,738 1,233
End of period 1,456 1,349 1,738
Supplemental disclosures of cash flow information      
Interest paid 19 17 16
Income taxes paid, net 62 49 2
Supplemental schedule of noncash investing and financing activities      
Payable for purchase of property and equipment $ 2 $ 3 $ 2