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Investments | 3 Months Ended
--- | ---
Mar. 31, 2014
Investments Debt And Equity Securities [Abstract] |
Investments |
3) |  | Investments
The fair value of short-term investments with maturities or estimated lives of less than one year consists of the following:
|  | March 31, 2014 |  |  | December 31, 2013 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Bankers’ acceptance drafts |  | $ | 637 |  |  | $ | 491 |
Time deposits |  |  | 3,442 |  |  |  | 3,439 |
Commercial paper and certificates of deposit |  |  | 127,524 |  |  |  | 114,984 |
Corporate obligations |  |  | 16,826 |  |  |  | 18,351 |
U.S. agency obligations |  |  | 158,084 |  |  |  | 162,450 |
|  |  | 306,513 |  |  |  | 299,715 |
Trading investments: |  |  |  |  |  |  |  |
Mutual funds |  |  | — |  |  |  | 1,000 |
|  | $ | 306,513 |  |  | $ | 300,715 |
The fair value of long-term investments with maturities of more than one year consists of the following:
|  | March 31, 2014 |  |  | December 31, 2013 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits |  | $ | 54 |  |  | $ | 54 |
U.S. agency obligations |  |  | 53,566 |  |  |  | 60,351 |
|  | $ | 53,620 |  |  | $ | 60,405 |
The following tables show the gross unrealized gains and (losses) aggregated by investment category for short-term and long-term available-for-sale investments:
As of March 31, 2014: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bankers’ acceptance drafts |  | $ | 637 |  |  | $ | — |  |  | $ | — |  |  | $ | 637 |
Time deposits |  |  | 3,442 |  |  |  | — |  |  |  | — |  |  |  | 3,442 |
Commercial paper and certificates of deposit |  |  | 127,514 |  |  |  | 14 |  |  |  | (4 | ) |  |  | 127,524 |
Corporate obligations |  |  | 16,827 |  |  |  | 1 |  |  |  | (2 | ) |  |  | 16,826 |
U.S. agency obligations |  |  | 158,044 |  |  |  | 48 |  |  |  | (8 | ) |  |  | 158,084 |
|  | $ | 306,464 |  |  | $ | 63 |  |  | $ | (14 | ) |  | $ | 306,513 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 54 |  |  | $ | — |  |  | $ | — |  |  | $ | 54 |
U.S. agency obligations |  |  | 53,558 |  |  |  | 18 |  |  |  | (10 | ) |  |  | 53,566 |
|  | $ | 53,612 |  |  | $ | 18 |  |  | $ | (10 | ) |  | $ | 53,620 |
As of December 31, 2013: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
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 |
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, 2014 and 2013, respectively. The gains and losses for trading investments were immaterial for the three months ended March 31, 2014 and 2013.

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