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Investments | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments |
5) | Investments
Investments classified as short-term consist of the following:
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 102 |  |  | $ | 9,757 |
Bankers’ acceptance drafts |  |  | 989 |  |  |  | 5,330 |
Asset-backed securities |  |  | 9,113 |  |  |  | 36,990 |
Commercial paper |  |  | 19,359 |  |  |  | 13,750 |
Corporate obligations |  |  | 9,352 |  |  |  | 77,821 |
Municipal bonds |  |  | — |  |  |  | 1,970 |
U.S. treasury obligations |  |  | 13,298 |  |  |  | 28,078 |
U.S. agency obligations |  |  | 21,613 |  |  |  | 35,738 |
|  | $ | 73,826 |  |  | $ | 209,434 |
Investments classified as long-term consist of the following:
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 5,890 |  |  | $ | 6,255 |
Cost method investments: |  |  |  |  |  |  |  |
Minority interest in a private company |  |  | 4,400 |  |  |  | 4,400 |
|  | $ | 10,290 |  |  | $ | 10,655 |
The following table shows the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:
As of December 31, 2018: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 102 |  |  | $ | — |  |  | $ | — |  |  | $ | 102 |
Bankers’ acceptance drafts |  |  | 989 |  |  |  | — |  |  |  | — |  |  |  | 989 |
Asset-backed securities |  |  | 9,121 |  |  |  | 1 |  |  |  | (9 | ) |  |  | 9,113 |
Commercial paper |  |  | 19,504 |  |  |  | — |  |  |  | (145 | ) |  |  | 19,359 |
Corporate obligations |  |  | 9,367 |  |  |  | — |  |  |  | (15 | ) |  |  | 9,352 |
U.S. treasury obligations |  |  | 13,294 |  |  |  | 4 |  |  |  | — |  |  |  | 13,298 |
U.S. agency obligations |  |  | 21,617 |  |  |  | 2 |  |  |  | (6 | ) |  |  | 21,613 |
|  | $ | 73,994 |  |  | $ | 7 |  |  | $ | (175 | ) |  | $ | 73,826 |
As of December 31, 2018: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 5,546 |  |  | $ | 344 |  |  | $ | — |  |  | $ | 5,890 |
As of December 31, 2017: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 9,756 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 9,757 |
Bankers’ acceptance drafts |  |  | 5,330 |  |  |  | — |  |  |  | — |  |  |  | 5,330 |
Asset-backed securities |  |  | 37,017 |  |  |  | 15 |  |  |  | (42 | ) |  |  | 36,990 |
Commercial paper |  |  | 13,810 |  |  |  | — |  |  |  | (60 | ) |  |  | 13,750 |
Corporate obligations |  |  | 77,788 |  |  |  | 58 |  |  |  | (25 | ) |  |  | 77,821 |
Municipal bonds |  |  | 1,970 |  |  |  | — |  |  |  | — |  |  |  | 1,970 |
U.S. treasury obligations |  |  | 28,054 |  |  |  | 24 |  |  |  | — |  |  |  | 28,078 |
U.S. agency obligations |  |  | 35,728 |  |  |  | 10 |  |  |  | — |  |  |  | 35,738 |
|  | $ | 209,453 |  |  | $ | 108 |  |  | $ | (127 | ) |  | $ | 209,434 |
As of December 31, 2017: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,006 |  |  | $ | 249 |  |  | $ | — |  |  | $ | 6,255 |
The tables above, which show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments as of December 31, 2018 and 2017, reflect the inclusion within short-term investments of investments with contractual maturities greater than one year from the date of purchase. Management has the ability, if necessary, to liquidate any of its investments in order to meet the Company’s liquidity needs in the next 12 months. Accordingly, those investments with contractual maturities greater than one year from the date of purchase are classified as short-term on the accompanying balance sheets. Interest income is accrued as earned. Dividend income is recognized as income on the date the stock trades “ex-dividend.” The cost of marketable securities sold is determined by the specific identification method and realized gains or losses are reflected in income and were not material in 2018, 2017 and 2016.

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