| 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 | 15 | 10 | 30 | 45 | -3 | 85 | 123 | 238 | 315 | 227 | 293 | 369 | 375 | 139 |
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| Depreciation and amortization | - | - | - | - | - | 70 | 64 | 78 | 81 | 117 | 140 | 138 | 108 | 147 |
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| Amortization of deferred commissions costs | - | - | - | - | - | - | - | 48 | 53 | 61 | 63 | 76 | 95 | 117 |
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| Amortization of Debt Issuance Costs and Discounts | - | 2 | 3 | 3 | 3 | 3 | 2 | 1 | 1 | 2 | 2 | 2 | 2 | 3 |
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| Non-cash lease expense | - | - | - | - | - | - | - | - | 23 | 26 | 28 | 38 | 30 | 33 |
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| Stock-based compensation expense | 8 | 12 | 42 | 28 | 35 | 36 | 39 | 41 | 52 | 53 | 64 | 75 | 85 | 89 |
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| Deferred income taxes, net | -17 | 14 | -13 | -1 | -6 | 16 | -3 | 4 | 8 | -12 | 24 | -31 | -37 | -50 |
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| Credit loss expense | 2 | 1 | 2 | 5 | 7 | 7 | 6 | 7 | 11 | 25 | 11 | 18 | 35 | 36 |
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| Other operating activities, net | - | - | - | - | - | - | - | - | - | 0 | -1 | -2 | -3 | -1 |
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| Accounts receivable | 5 | -1 | 7 | 12 | 4 | 16 | 18 | 28 | 5 | 36 | 30 | 46 | 67 | 30 |
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| Prepaid expenses and other current assets | -1 | 3 | -3 | 3 | -0 | 1 | 4 | 2 | 14 | -2 | 15 | 18 | 16 | 7 |
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| Deferred commissions | - | - | - | - | - | - | - | -53 | -67 | -64 | -72 | -117 | -120 | -120 |
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| Accounts payable and other liabilities | 4 | 2 | -4 | 6 | 10 | -2 | 12 | -14 | 18 | 101 | -30 | 23 | 34 | 44 |
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| Lease liabilities | - | - | - | - | - | - | - | - | -25 | -30 | -31 | -37 | -39 | -38 |
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| Income taxes payable, net | - | - | - | - | - | - | - | - | -1 | 10 | 6 | -19 | 11 | 22 |
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| Deferred revenue | - | - | - | - | - | - | - | 8 | 8 | 2 | 17 | 7 | -1 | 11 |
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| Other assets | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
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| Net cash provided by operating activities | 26 | 86 | 108 | 144 | 131 | 196 | 235 | 335 | 458 | 486 | 470 | 479 | 490 | 393 |
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| Proceeds from sale and settlement of investments | 5 | 15 | 0 | 6 | 2 | 6 | - | - | - | 10 | - | 1 | 4 | - |
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| Proceeds from sale of property and equipment and other assets | - | - | - | - | - | - | - | - | - | - | 1 | 30 | - | 2 |
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| Purchases of property, equipment, and other assets for new campuses | - | - | - | - | - | - | - | - | - | - | 124 | 35 | 118 | 579 |
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| Purchases of property, equipment, and other assets | - | - | - | - | - | - | - | - | - | - | 65 | 59 | 25 | 59 |
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| Cash paid for acquisitions, net of cash acquired | 15 | 641 | - | 584 | 182 | 10 | 48 | 418 | 438 | 426 | 193 | 6 | 100 | 277 |
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| Net cash (used in) investing activities | 58 | -640 | -19 | -606 | -216 | -23 | -72 | -448 | -484 | -464 | -381 | -69 | -239 | -913 |
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| Payments of long-term debt assumed in acquisition | - | 4 | 18 | 318 | 20 | 20 | 345 | - | - | 745 | - | 2 | - | - |
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| Repurchase of restricted stock to satisfy tax withholding obligations | 2 | 4 | 8 | 51 | 16 | 16 | 15 | 24 | 28 | 39 | 33 | 23 | 26 | 30 |
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| Proceeds from Issuance of Common Stock | 248 | - | - | 529 | - | - | 834 | - | - | 1,690 | - | 746 | - | - |
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| Proceeds From Exercise Of Stock Options and ESPP | 7 | 10 | 18 | 6 | 7 | 6 | 10 | 27 | 25 | 30 | 18 | 14 | 23 | 25 |
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| Payments of debt issuance costs | - | 12 | - | 10 | - | - | 3 | - | - | 17 | - | - | - | 4 |
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| Principal repayments of finance lease obligations | - | - | - | - | - | - | - | - | - | - | - | - | - | 5 |
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| Net cash (used in) provided by financing activities | 255 | 165 | 10 | 734 | -21 | -26 | 480 | 3 | -4 | 2,662 | -16 | 734 | -4 | -14 |
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| Effect of foreign currency exchange rates on cash and cash equivalents | - | - | - | - | - | - | - | - | 0 | 1 | -1 | -3 | 1 | -1 |
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| Net (decrease) increase in cash and cash equivalents | - | - | - | - | - | - | - | - | -30 | 2,685 | 71 | 1,141 | 248 | -535 |
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| Interest paid | - | - | - | - | - | - | - | 1 | 2 | 6 | 32 | 30 | 31 | 31 |
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| Income taxes paid | - | - | - | - | - | - | - | 36 | 69 | 46 | 82 | 169 | 163 | 100 |
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| Consideration owed for acquisitions | - | - | - | - | - | - | - | - | 2 | 1 | 0 | - | 8 | 1 |
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| Accrued capital expenditures and non-cash landlord incentives | - | - | - | - | - | - | - | - | - | - | 2 | 15 | 29 | 64 |
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