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Investments (Tables) | 12 Months Ended
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Dec. 31, 2013
Investments Debt And Equity Securities [Abstract] |
Fair Value of Short-term Available-for-Sale and Trading Investments | The fair value of short-term investments with maturities or estimated lives of less than one year consists of the following:
|  | Years Ended December 31, |
|  | 2013 |  |  | 2012 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits |  | $ | 3,439 |  |  | $ | 52 |
Bankers acceptance drafts |  |  | 491 |  |  |  | 242 |
Commercial paper and certificates of deposit |  |  | 114,984 |  |  |  | — |
Corporate obligations |  |  | 18,351 |  |  |  | — |
U.S. treasury obligations |  |  | — |  |  |  | 13,054 |
U.S. agency obligations |  |  | 162,450 |  |  |  | 313,514 |
|  |  | 299,715 |  |  |  | 326,862 |
Trading investments: |  |  |  |  |  |  |  |
Mutual funds (1) |  |  | 1,000 |  |  |  | 791 |
|  | $ | 300,715 |  |  | $ | 327,653 |
(1) | The mutual funds are associated with the Company’s supplemental defined contribution retirement obligations.
Fair Value of Long-term Available-for-Sale Investments | The fair value of long-term available-for-sale investments with maturities or estimated lives of more than one year consists of the following:
|  | Years Ended December 31, |
|  | 2013 |  |  | 2012 |
Time deposits |  | $ | 54 |  |  | $ | — |
U.S. agency obligations |  |  | 60,351 |  |  |  | 12,158 |
|  | $ | 60,405 |  |  | $ | 12,158 |
Gross Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term and Long-Term Securities | The following table shows the gross unrealized gains and (losses) aggregated by investment category for short-term and long-term available-for-sale investments:
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 3,439 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,439 |
Bankers acceptance drafts |  |  | 491 |  |  |  | — |  |  |  | — |  |  |  | 491 |
Commercial paper and certificates of deposit |  |  | 114,973 |  |  |  | 15 |  |  |  | (4 | ) |  |  | 114,984 |
Corporate obligations |  |  | 18,360 |  |  |  | — |  |  |  | (9 | ) |  |  | 18,351 |
U.S. agency obligations |  |  | 162,430 |  |  |  | 22 |  |  |  | (2 | ) |  |  | 162,450 |
|  | $ | 299,693 |  |  | $ | 37 |  |  | $ | (15 | ) |  | $ | 299,715 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 54 |  |  | $ | — |  |  | $ | — |  |  | $ | 54 |
U.S. agency obligations |  |  | 60,374 |  |  |  | 9 |  |  |  | (32 | ) |  |  | 60,351 |
|  | $ | 60,428 |  |  | $ | 9 |  |  | $ | (32 | ) |  | $ | 60,405 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 52 |  |  | $ | — |  |  | $ | — |  |  | $ | 52 |
Bankers acceptance drafts |  |  | 242 |  |  |  | — |  |  |  | — |  |  |  | 242 |
U.S. treasury obligations |  |  | 13,045 |  |  |  | 9 |  |  |  | — |  |  |  | 13,054 |
U.S. agency obligations |  |  | 313,262 |  |  |  | 258 |  |  |  | (6 | ) |  |  | 313,514 |
|  | $ | 326,601 |  |  | $ | 267 |  |  | $ | (6 | ) |  | $ | 326,862 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency obligations |  | $ | 12,156 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 12,158 |

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