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Investments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Investments |  |
Total short-term investments, amortized cost | $ 308,064,000 | $ 323,353,000
Total short-term investments, fair value | 313,379,000 | 323,256,000
Estimated fair value of fixed rate securities designated as available-for-sale, classified by the contractual maturity date of the security |  |
Due within one year | 2,587,000 |
Due after one year through three years | 52,411,000 |
Due after three years | 60,721,000 |
Total fixed rate securities | 115,719,000 |
Available-for-sale securities |  |
Investments |  |
Amortized Cost | 297,556,000 | 297,916,000
Fair Value | 282,829,000 | 297,443,000
Money market funds |  |
Investments |  |
Amortized Cost | 126,537,000 | 139,420,000
Fair Value | 126,537,000 | 139,420,000
Money market funds | Denominated in Euros |  |
Investments |  |
Fair Value | 6,437,000 | 25,755,000
Money market funds | Denominated in British pounds |  |
Investments |  |
Fair Value | 2,620,000 |
Money market funds | Denominated in Canadian dollars |  |
Investments |  |
Fair Value | 2,441,000 |
Corporate bonds |  |
Investments |  |
Amortized Cost | 67,275,000 | 88,589,000
Fair Value | 69,214,000 | 89,146,000
U.S. Government agency securities |  |
Investments |  |
Amortized Cost | 23,647,000 | 9,720,000
Fair Value | 23,775,000 | 9,757,000
Emerging markets debt mutual fund |  |
Investments |  |
Amortized Cost | 17,693,000 | 17,693,000
Fair Value | 18,734,000 | 16,399,000
U.S. Treasury securities |  |
Investments |  |
Amortized Cost | 17,165,000 | 4,848,000
Fair Value | 17,169,000 | 4,905,000
Collateralized mortgage obligations |  |
Investments |  |
Amortized Cost | 15,059,000 | 14,915,000
Fair Value | 15,162,000 | 15,011,000
Asset backed debt securities |  |
Investments |  |
Amortized Cost | 12,180,000 | 3,533,000
Fair Value | 12,238,000 | 3,533,000
Fixed rate municipal notes and bonds |  |
Investments |  |
Amortized Cost |  | 17,718,000
Fair Value |  | 17,788,000
Other |  |
Investments |  |
Amortized Cost |  | 1,480,000
Fair Value |  | 1,484,000
Trading securities |  |
Investments |  |
Unrealized gains related to trading securities | 2,042,000 | 376,000
High yield trading debt securities |  |
Investments |  |
Amortized Cost | 21,839,000 | 20,155,000
Fair Value | 23,406,000 | 20,750,000
Emerging markets trading debt mutual fund |  |
Investments |  |
Amortized Cost | 3,046,000 | 2,620,000
Fair Value | 3,237,000 | 2,487,000
Emerging markets trading debt securities |  |
Investments |  |
Amortized Cost | 2,361,000 | 2,444,000
Fair Value | 2,600,000 | 2,355,000
Other trading investments |  |
Investments |  |
Amortized Cost | 1,262,000 | 218,000
Fair Value | $ 1,307,000 | $ 221,000

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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