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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Investments Classified as Short-Term and Long-Term Available-for-Sale Investments and Long-Term Cost Method 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.
Gross Unrealized Gains and (Losses) Aggregated by Investment Category | 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 |

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