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Supplemental Financial Statement Information | 3 Months Ended
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Mar. 31, 2019
Balance Sheet Components Disclosure [Abstract] |
Supplemental Financial Statement Information |
3. | Supplemental Financial Statement Information
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.
The Company’s short-term investments are classified as available-for-sale. Available-for-sale investments are reported at fair value, with unrealized gains and losses, included as a separate component of stockholders’ deficit within accumulated other comprehensive income. The weighted-average remaining maturity of the Company’s investment portfolio was less than one year as of the periods presented. No individual security incurred continuous unrealized losses for greater than 12 months. Insurance Reserves 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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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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