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Investments (Details) (USD $) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |
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Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Available-for-sale securities | Dec. 31, 2011 Available-for-sale securities | Jun. 30, 2012 Corporate bonds | Dec. 31, 2011 Corporate bonds | Jun. 30, 2012 Money market funds and deposit accounts | Dec. 31, 2011 Money market funds and deposit accounts | Jun. 30, 2012 Money market funds and deposit accounts Denominated in Euros | Jun. 30, 2012 Money market funds and deposit accounts Denominated in Canadian dollars | Jun. 30, 2012 Enhanced cash mutual fund | Jun. 30, 2012 Collateralized mortgage obligations | Dec. 31, 2011 Collateralized mortgage obligations | Jun. 30, 2012 Fixed rate municipal notes and bonds | Dec. 31, 2011 Fixed rate municipal notes and bonds | Jun. 30, 2012 U.S. Government agency securities | Dec. 31, 2011 U.S. Government agency securities | Jun. 30, 2012 U.S. Treasury securities | Dec. 31, 2011 U.S. Treasury securities | Jun. 30, 2012 Emerging markets debt mutual fund | Dec. 31, 2011 Emerging markets debt mutual fund | Jun. 30, 2012 Asset backed debt securities | Dec. 31, 2011 Asset backed debt securities | Jun. 30, 2012 Other | Dec. 31, 2011 Other | Jun. 30, 2012 Trading securities | Jul. 02, 2011 Trading securities | Jun. 30, 2012 Trading securities | Jul. 02, 2011 Trading securities | Jun. 30, 2012 High yield trading debt securities | Dec. 31, 2011 High yield trading debt securities | Jun. 30, 2012 Emerging markets trading debt mutual fund | Dec. 31, 2011 Emerging markets trading debt mutual fund | Jun. 30, 2012 Emerging markets trading debt securities | Dec. 31, 2011 Emerging markets trading debt securities | Jun. 30, 2012 Other trading debt securities | Dec. 31, 2011 Other trading debt securities
Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (losses) gain related to trading securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (135,000) | $ (203,000) | $ 656,000 | $ 1,366,000 |  |  |  |  |  |  |  |
Amortized Cost |  |  | 411,142,000 | 297,916,000 | 134,965,000 | 88,589,000 | 101,011,000 | 139,420,000 |  |  | 50,000,000 | 24,859,000 | 14,915,000 | 23,553,000 | 17,718,000 | 22,424,000 | 9,720,000 | 20,458,000 | 4,848,000 | 17,693,000 | 17,693,000 | 15,499,000 | 3,533,000 | 680,000 | 1,480,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  | 412,207,000 | 297,443,000 | 136,258,000 | 89,146,000 | 101,011,000 | 139,420,000 | 5,214,000 | 6,106,000 | 50,072,000 | 24,944,000 | 15,011,000 | 23,592,000 | 17,788,000 | 22,572,000 | 9,757,000 | 20,526,000 | 4,905,000 | 17,035,000 | 16,399,000 | 15,514,000 | 3,533,000 | 683,000 | 1,484,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortized Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,129,000 | 20,155,000 | 2,966,000 | 2,620,000 | 2,004,000 | 2,444,000 | 684,000 | 218,000
Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,084,000 | 20,750,000 | 2,919,000 | 2,487,000 | 2,073,000 | 2,355,000 | 754,000 | 221,000
Total short-term investments, amortized cost | 437,925,000 | 323,353,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total short-term investments, fair value | 440,037,000 | 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 | 44,983,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due after one year through three years | 88,072,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due after three years | 67,516,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fixed rate securities | $ 200,571,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 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 2: 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=6379932&loc=d3e22054-111558 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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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 1 -Subparagraph g Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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