| Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income (loss) | 10 | 22 | 38 | 33 | 36 | 27 | 33 | 11 | -90 | -61 | -63 | -346 | 68 | 99 |
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| Stock-based compensation | 9 | 12 | 13 | 19 | 30 | 41 | 53 | 64 | 81 | 103 | 116 | 122 | 143 | 143 |
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| Amortization of deferred commissions | - | - | - | - | - | - | - | - | - | - | - | - | 59 | 62 |
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| Depreciation, Depletion and Amortization | 17 | 19 | 20 | 23 | 23 | 24 | 25 | 25 | 21 | 21 | 29 | 19 | 19 | 18 |
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| Operating Lease, Expense | - | - | - | - | - | - | - | - | 14 | 16 | 13 | 16 | - | 18 |
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| Foreign currency transaction loss (gain) | -1 | 1 | -2 | -4 | -4 | 2 | -1 | 2 | -2 | 4 | -6 | 5 | -5 | -1 |
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| Loss on capped call transactions | - | - | - | - | - | - | - | - | - | 32 | -24 | -57 | -1 | -1 |
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| Deferred income taxes | - | - | - | - | -2 | -6 | 14 | -31 | -49 | -60 | -75 | 169 | 0 | -2 |
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| (Accretion) amortization of investments | -1 | -1 | -2 | -2 | -2 | -2 | -1 | -2 | -1 | -1 | -4 | - | - | 15 |
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| (Gain) on investments | - | - | - | - | - | - | - | - | - | - | - | - | 11 | 1 |
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| (Gain) on repurchases of convertible senior notes | - | - | - | - | - | - | - | - | - | - | - | - | 8 | 0 |
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| Other non-cash | -0 | -3 | -2 | 1 | -1 | 1 | 1 | 2 | 1 | 1 | -1 | -0 | -2 | -4 |
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| Accounts receivable, unbilled receivables, and contract assets | 19 | 35 | 28 | -6 | 62 | 57 | -24 | -26 | -1 | 32 | 12 | 51 | 58 | -79 |
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| Other current assets | -9 | -7 | -7 | -3 | -3 | 11 | 13 | 6 | 6 | 13 | -17 | 9 | -11 | 50 |
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| Other current liabilities | 9 | -8 | 6 | 13 | 17 | 2 | 14 | 21 | 26 | 38 | -19 | 1 | -9 | -7 |
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| Deferred revenue | - | - | - | - | - | - | - | 29 | 2 | 44 | 41 | 63 | 45 | 48 |
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| Deferred commissions | - | - | - | - | - | - | - | 44 | 50 | 55 | 71 | 54 | 45 | 58 |
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| Other long-term assets and liabilities | -8 | -10 | -7 | -3 | 2 | -0 | 1 | 5 | 24 | 14 | 16 | 13 | 24 | -7 |
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| Cash provided by operating activities | 40 | 44 | 81 | - | - | - | - | 104 | -42 | -1 | 39 | 22 | 218 | 346 |
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| Purchases of investments | - | - | - | - | - | - | 28 | 69 | 11 | 327 | 79 | 41 | 287 | 559 |
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| Proceeds from maturities and called investments | 21 | 25 | 28 | 33 | 42 | 23 | 27 | 34 | 14 | 29 | 106 | 67 | 243 | 365 |
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| Sales of investments | - | - | - | - | - | - | - | - | 89 | 1 | 61 | 24 | 11 | - |
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| Payments for acquisitions, net of cash acquired | - | - | 26 | 4 | 2 | 49 | 0 | 1 | 11 | - | 5 | 1 | - | - |
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| Investment in property and equipment | 10 | 24 | 6 | 11 | 11 | 19 | 14 | 12 | 11 | 25 | 10 | 35 | 17 | 8 |
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| Cash (used in) provided by investing activities | -45 | -19 | -64 | - | - | - | - | -48 | 70 | -322 | 73 | 13 | -51 | -203 |
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| Repurchases of convertible senior notes | - | - | - | - | - | - | - | - | - | - | - | - | 89 | 34 |
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| Dividend payments to stockholders | 4 | 6 | 3 | 7 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 |
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| Proceeds from Stock Plans | - | - | - | - | - | - | - | - | - | - | 11 | 9 | 8 | 7 |
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| Proceeds from stock option exercises | - | - | - | - | - | - | - | - | - | - | - | - | 11 | 81 |
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| Common stock repurchases for tax withholdings for net settlement of equity awards | - | - | - | 6 | 10 | 16 | 41 | 38 | 43 | 73 | 70 | 21 | 2 | 5 |
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| Common stock repurchases under stock repurchase program | 5 | 5 | 12 | 15 | 23 | 27 | 4 | 54 | 22 | 28 | 53 | 26 | - | 68 |
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| Other | - | - | - | - | - | - | - | - | - | - | - | - | 0 | 0 |
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| Cash (used in) financing activities | -6 | -8 | -15 | - | - | - | - | -101 | -74 | 423 | -122 | -47 | -82 | -30 |
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| Effect of exchange rate changes on cash, cash equivalents, and restricted cash | - | - | - | - | - | - | - | - | 0 | 2 | -2 | -3 | 3 | -4 |
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| Net increase (decrease) in cash, cash equivalents and restricted cash | - | - | - | - | - | - | - | - | -46 | 104 | -12 | -15 | 88 | 109 |
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| Interest Paid on Convertible Debt | - | - | - | - | - | - | - | - | - | - | - | - | - | 4 |
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| Income taxes paid | 3 | 5 | 11 | 15 | 30 | 29 | -2 | 7 | 5 | 3 | -5 | 8 | 12 | 82 |
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| Capital Expenditures Incurred but Not yet Paid | - | - | - | - | - | - | - | - | - | - | - | 10 | 0 | 2 |
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