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Investments | 12 Months Ended
--- | ---
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Investments |
5) | 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, |
|  | 2014 |  |  | 2013 |
Available-for-sale investments: |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 20,900 |  |  | $ | 64,989 |
Bankers acceptance drafts |  |  | 82 |  |  |  | 491 |
Commercial paper |  |  | — |  |  |  | 53,434 |
Corporate obligations |  |  | 24,020 |  |  |  | 18,351 |
Municipal bonds |  |  | 2,099 |  |  |  | — |
U.S. agency obligations |  |  | 82,493 |  |  |  | 162,450 |
|  |  | 129,594 |  |  |  | 299,715 |
Trading securities: |  |  |  |  |  |  |  |
Mutual funds (1) |  |  | — |  |  |  | 1,000 |
|  | $ | 129,594 |  |  | $ | 300,715 |
(1) | The mutual funds are associated with the Company’s supplemental defined contribution retirement obligations.
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, |
|  | 2014 |  |  | 2013 |
Time deposits and certificates of deposit |  | $ | 48 |  |  | $ | 54 |
Asset-backed securities |  |  | 75,674 |  |  |  | — |
Corporate obligations |  |  | 64,669 |  |  |  | — |
Municipal bonds |  |  | 1,254 |  |  |  | — |
U.S. agency obligations |  |  | 15,556 |  |  |  | 60,351 |
|  | $ | 157,201 |  |  | $ | 60,405 |
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, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 20,901 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 20,900 |
Bankers acceptance drafts |  |  | 82 |  |  |  | — |  |  |  | — |  |  |  | 82 |
Corporate obligations |  |  | 24,029 |  |  |  | 2 |  |  |  | (11 | ) |  |  | 24,020 |
Municipal bonds |  |  | 2,100 |  |  |  | — |  |  |  | (1 | ) |  |  | 2,099 |
U.S. agency obligations |  |  | 82,488 |  |  |  | 14 |  |  |  | (9 | ) |  |  | 82,493 |
|  | $ | 129,600 |  |  | $ | 16 |  |  | $ | (22 | ) |  | $ | 129,594 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | $ | 48 |  |  | $ | — |  |  | $ | — |  |  | $ | 48 |
Asset-backed securities |  |  | 75,778 |  |  |  | 5 |  |  |  | (109 | ) |  |  | 75,674 |
Corporate obligations |  |  | 64,842 |  |  |  | 1 |  |  |  | (174 | ) |  |  | 64,669 |
Municipal bonds |  |  | 1,258 |  |  |  | — |  |  |  | (4 | ) |  |  | 1,254 |
U.S. agency obligations |  |  | 15,563 |  |  |  | 2 |  |  |  | (9 | ) |  |  | 15,556 |
|  | $ | 157,489 |  |  | $ | 8 |  |  | $ | (296 | ) |  | $ | 157,201 |
|  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
As of December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 64,983 |  |  | $ | 10 |  |  | $ | (4 | ) |  | $ | 64,989 |
Bankers acceptance drafts |  |  | 491 |  |  |  | — |  |  |  | — |  |  |  | 491 |
Commercial paper |  |  | 53,429 |  |  |  | 5 |  |  |  | — |  |  |  | 53,434 |
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 and certificates of deposit |  | $ | 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 and realized gains or losses are reflected in income and was not material in 2014, 2013 and 2012.

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