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Investments | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Investments |
5) | Investments
Investments classified as short-term consists of the following:
|  | Years Ended December 31, |
Available-for-sale investments: |  | 2016 |  |  | 2015 |
Time deposits and certificates of deposit |  | $ | 23,818 |  |  | $ | 11,892 |
Bankers’ acceptance drafts |  |  | 1,439 |  |  |  | 728 |
Asset-backed securities |  |  | 36,809 |  |  |  | 124,997 |
Commercial paper |  |  | 24,381 |  |  |  | — |
Corporate obligations |  |  | 46,707 |  |  |  | 165,109 |
Municipal bonds |  |  | 591 |  |  |  | 8,355 |
Promissory note |  |  | 675 |  |  |  | — |
U.S. treasury obligations |  |  | 25,414 |  |  |  | — |
U.S. agency obligations |  |  | 29,629 |  |  |  | 119,582 |
|  | $ | 189,463 |  |  | $ | 430,663 |
Investments classified as long-term consists of the following:
|  | Years Ended December 31, |
Available-for-sale investments: |  | 2016 |  |  | 2015 |
Group insurance contracts |  | $ | 5,558 |  |  | $ | — |
Cost method investments: |  |  |  |  |  |  |  |
Minority interest in a private company(1) |  |  | 4,300 |  |  |  | — |
|  | $ | 9,858 |  |  | $ | — |
(1) | In April of 2016 the Company invested $9,300 for a minority interest in a private company. During 2016, the Company recognized $5,000 of impairment charges related to this cost method investment.
The following table shows the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:
As of December 31, 2016: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 23,818 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,818 |
Bankers acceptance drafts |  |  | 1,439 |  |  |  | — |  |  |  | — |  |  |  | 1,439 |
Asset-backed securities |  |  | 36,847 |  |  |  | 6 |  |  |  | (44 | ) |  |  | 36,809 |
Commercial paper |  |  | 24,423 |  |  |  | — |  |  |  | (42 | ) |  |  | 24,381 |
Corporate obligations |  |  | 46,700 |  |  |  | 21 |  |  |  | (14 | ) |  |  | 46,707 |
Municipal bonds |  |  | 591 |  |  |  | — |  |  |  | — |  |  |  | 591 |
Promissory note |  |  | 675 |  |  |  | — |  |  |  | — |  |  |  | 675 |
U.S. treasury obligations |  |  | 25,414 |  |  |  | — |  |  |  | — |  |  |  | 25,414 |
U.S. agency obligations |  |  | 29,631 |  |  |  | 8 |  |  |  | (10 | ) |  |  | 29,629 |
|  | $ | 189,538 |  |  | $ | 35 |  |  | $ | (110 | ) |  | $ | 189,463 |
As of December 31, 2016: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group insurance contracts |  | $ | 6,276 |  |  | $ | — |  |  | $ | (718 | ) |  | $ | 5,558 |
Cost method investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minority interest in a private company(1) |  |  | 4,300 |  |  |  | — |  |  |  | — |  |  |  | 4,300 |
|  | $ | 10,576 |  |  | $ | — |  |  | $ | (718 | ) |  | $ | 9,858 |
(1) | In April of 2016 the Company invested $9,300 for a minority interest in a private company. During 2016, the Company recognized $5,000 of impairment charges related to this cost method investment.
As of December 31, 2015: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 11,893 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 11,892 |
Bankers acceptance drafts |  |  | 728 |  |  |  | — |  |  |  | — |  |  |  | 728 |
Asset-backed securities |  |  | 125,271 |  |  |  | — |  |  |  | (274 | ) |  |  | 124,997 |
Corporate obligations |  |  | 165,445 |  |  |  | 5 |  |  |  | (341 | ) |  |  | 165,109 |
Municipal bonds |  |  | 8,346 |  |  |  | 13 |  |  |  | (4 | ) |  |  | 8,355 |
U.S. agency obligations |  |  | 119,699 |  |  |  | 3 |  |  |  | (120 | ) |  |  | 119,582 |
|  | $ | 431,382 |  |  | $ | 21 |  |  | $ | (740 | ) |  | $ | 430,663 |
The tables above, which show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments as of December 31, 2016 and 2015, 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 was not material in 2016, 2015 and 2014.

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