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Investments (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Fair Value of Investments Classified as Short-Term Available-for-Sale Investments | The fair value of investments classified as short-term consists of the following:
|  | Years Ended December 31, |
Available-for-sale investments: |  | 2015 |  |  | 2014 |
Time deposits and certificates of deposit |  | $ | 11,892 |  |  | $ | 20,948 |
Bankers acceptance drafts |  |  | 728 |  |  |  | 82 |
Asset-backed securities |  |  | 124,997 |  |  |  | 75,674 |
Corporate obligations |  |  | 165,109 |  |  |  | 88,689 |
Municipal bonds |  |  | 8,355 |  |  |  | 3,353 |
U.S. agency obligations |  |  | 119,582 |  |  |  | 98,049 |
|  | $ | 430,663 |  |  | $ | 286,795 |
Gross Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term Securities | The following table shows the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:
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 |
As of December 31, 2014: |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Estimated Fair Value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits and certificates of deposit |  | $ | 20,949 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 20,948 |
Bankers acceptance drafts |  |  | 82 |  |  |  | — |  |  |  | — |  |  |  | 82 |
Asset-backed securities |  |  | 75,778 |  |  |  | 5 |  |  |  | (109 | ) |  |  | 75,674 |
Corporate obligations |  |  | 88,871 |  |  |  | 3 |  |  |  | (185 | ) |  |  | 88,689 |
Municipal bonds |  |  | 3,357 |  |  |  | — |  |  |  | (4 | ) |  |  | 3,353 |
U.S. agency obligations |  |  | 98,051 |  |  |  | 16 |  |  |  | (18 | ) |  |  | 98,049 |
|  | $ | 287,088 |  |  | $ | 24 |  |  | $ | (317 | ) |  | $ | 286,795 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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