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Investments | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments |
4) | Investments
The fair value of investments classified as short-term consists of the following:
|  | March 31, 2018 |  |  | December 31, 2017 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 10,459 |  |  | $ | 9,757 |
Bankers’ acceptance drafts |  |  | 2,179 |  |  |  | 5,330 |
Asset-backed securities |  |  | 38,012 |  |  |  | 36,990 |
Commercial paper |  |  | 16,010 |  |  |  | 13,750 |
Corporate obligations |  |  | 78,767 |  |  |  | 77,821 |
Municipal bonds |  |  | 2,618 |  |  |  | 1,970 |
U.S. treasury obligations |  |  | 30,220 |  |  |  | 28,078 |
U.S. agency obligations |  |  | 22,349 |  |  |  | 35,738 |
|  | $ | 200,614 |  |  | $ | 209,434 |
Investments classified as long-term consist of the following:
|  | March 31, 2018 |  |  | December 31, 2017 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,441 |  |  | $ | 6,255 |
Cost method investments: |  |  |  |  |  |  |  |
Minority interest in a private company |  |  | 4,400 |  |  |  | 4,400 |
|  | $ | 10,841 |  |  | $ | 10,655 |
The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:
As of March 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 |  | $ | 10,458 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 10,459 |
Bankers’ acceptance drafts |  |  | 2,179 |  |  |  | — |  |  |  | — |  |  |  | 2,179 |
Asset-backed securities |  |  | 38,056 |  |  |  | 13 |  |  |  | (57 | ) |  |  | 38,012 |
Commercial paper |  |  | 16,065 |  |  |  | — |  |  |  | (55 | ) |  |  | 16,010 |
Corporate obligations |  |  | 78,778 |  |  |  | 38 |  |  |  | (49 | ) |  |  | 78,767 |
Municipal bonds |  |  | 2,620 |  |  |  | — |  |  |  | (2 | ) |  |  | 2,618 |
U.S. treasury obligations |  |  | 30,196 |  |  |  | 24 |  |  |  | — |  |  |  | 30,220 |
U.S. agency obligations |  |  | 22,343 |  |  |  | 6 |  |  |  | — |  |  |  | 22,349 |
|  | $ | 200,695 |  |  | $ | 82 |  |  | $ | (163 | ) |  | $ | 200,614 |
As of March 31, 2018: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,382 |  |  | $ | 59 |  |  | $ | — |  |  | $ | 6,441 |
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 March 31, 2018 and December 31, 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. The Company reviews and evaluates its investments for any indication of possible impairment. Based on this review, the Company has determined that the unrealized losses related to these investments at March 31, 2018 and December 31, 2017, were temporary. 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. Realized gains or losses are reflected in income and were not material for the three months ended March 31, 2018 and 2017.

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