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v3.19.1

Supplemental Financial Statement Information (Tables) | 3 Months Ended
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Mar. 31, 2019
Balance Sheet Components Disclosure [Abstract] |
Summary of Cash Equivalents and Short-Term Investments | The following tables summarize the cost or amortized cost, gross unrealized gain, gross unrealized loss and fair value of the Company’s cash equivalents and short-term investments as of the dates indicated (in thousands):
|  | March 31, 2019 |
|  | Cost or Amortized |  |  | Unrealized |  |  | Estimated Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Unrestricted Balances (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 1,406 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,406 |
Certificates of deposit |  |  | 168,700 |  |  |  | 203 |  |  |  | — |  |  |  | 168,903 |
Commercial paper |  |  | 441,803 |  |  |  | 190 |  |  |  | (32 | ) |  |  | 441,961 |
Corporate bonds |  |  | 94,415 |  |  |  | 93 |  |  |  | (1 | ) |  |  | 94,507 |
Total unrestricted cash equivalents and short-term investments |  |  | 706,324 |  |  |  | 486 |  |  |  | (33 | ) |  |  | 706,777 |
Restricted Balances (2)(3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 2,822 |  |  |  | — |  |  |  | — |  |  |  | 2,822 |
Certificates of deposit |  |  | 348,007 |  |  |  | 364 |  |  |  | (2 | ) |  |  | 348,369 |
Commercial paper |  |  | 696,251 |  |  |  | 176 |  |  |  | (90 | ) |  |  | 696,337 |
Corporate bonds |  |  | 62,204 |  |  |  | 58 |  |  |  | (8 | ) |  |  | 62,254 |
Total restricted cash equivalents and investments |  |  | 1,109,284 |  |  |  | 598 |  |  |  | (100 | ) |  |  | 1,109,782 |
Total unrestricted and restricted cash equivalents and investments |  | $ | 1,815,608 |  |  | $ | 1,084 |  |  | $ | (133 | ) |  | $ | 1,816,559 |
(1) | Included in cash and cash equivalents and short-term investments in the Company’s condensed consolidated balance sheet as of March 31, 2019 in addition to $328.1 million of cash.
(2) | Included in restricted cash and cash equivalents and restricted investments in the Company’s condensed consolidated balance sheet as of March 31, 2019 in addition to $58.0 million of restricted cash.
(3) | Included in prepaid expenses and other current assets in the Company’s condensed consolidated balance sheet as of March 31, 2019 is $1.9 million of restricted cash.
|  | December 31, 2018 |
|  | Cost or Amortized |  |  | Unrealized |  |  | Estimated Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Unrestricted Balances (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 38,528 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,528 |
Certificates of deposit |  |  | 497,748 |  |  |  | 19 |  |  |  | (213 | ) |  |  | 497,554 |
Commercial paper |  |  | 1,135,092 |  |  |  | 38 |  |  |  | (409 | ) |  |  | 1,134,721 |
Corporate bonds |  |  | 119,043 |  |  |  | 19 |  |  |  | (23 | ) |  |  | 119,039 |
Total unrestricted cash equivalents and short-term investments |  |  | 1,790,411 |  |  |  | 76 |  |  |  | (645 | ) |  |  | 1,789,842 |
Restricted Balances (2)(3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 4,620 |  |  |  | — |  |  |  | — |  |  |  | 4,620 |
Certificates of deposit |  |  | 307,650 |  |  |  | 41 |  |  |  | (87 | ) |  |  | 307,604 |
Commercial paper |  |  | 624,719 |  |  |  | 17 |  |  |  | (227 | ) |  |  | 624,509 |
Corporate bonds |  |  | 65,616 |  |  |  | 6 |  |  |  | (36 | ) |  |  | 65,586 |
Total restricted cash equivalents and investments |  |  | 1,002,605 |  |  |  | 64 |  |  |  | (350 | ) |  |  | 1,002,319 |
Total unrestricted and restricted cash equivalents and investments |  | $ | 2,793,016 |  |  | $ | 140 |  |  | $ | (995 | ) |  | $ | 2,792,161 |
(1) | Included in cash and cash equivalents and short-term investments in the Company’s condensed consolidated balance sheet as of December 31, 2018 in addition to $248.0 million of cash.
(2) | Included in restricted cash and cash equivalents and restricted investments in the Company’s condensed consolidated balance sheet as of December 31, 2018 in addition to $50.2 million of restricted cash.
(3) | Included in prepaid expenses and other current assets in the Company’s condensed consolidated balance sheet as of December 31, 2018 is $1.4 million of restricted cash.
Summary of Rollforward of the Insurance Reserve | The following table provides a rollforward of the insurance reserve for the periods presented (in thousands):
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Beginning balance |  | $ | 810,273 |  |  | $ | 376,538 |
Losses paid |  |  | (99,551 | ) |  |  | (48,855 | )
Change in estimates |  |  | 23,820 |  |  |  | 3,392 |
Reserves for current period |  |  | 202,442 |  |  |  | 135,193 |
Ending balance |  | $ | 936,984 |  |  | $ | 466,268 |

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