v2.4.0.6

Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 M | Dec. 31, 2010
Available-for-sale securities |  |
Less amounts classified as cash equivalents | $ (38,721) | $ (157,151)
Less amounts classified as restricted cash | (893) | (893)
Amortized Cost | 196,120 | 146,268
Gross Unrealized Gains | 36 | 49
Gross Unrealized Losses | (19) | (16)
Amounts classified as marketable securities | 196,137 | 146,301
Net realized gains (losses) on marketable securities |  |
Realized gains |  | 3
Realized losses | (2) |
Net realized gains (losses) | (2) | 3
Fair Value |  |
Fair Value, In loss position for less than 12 months | 50,561 |
Fair Value, Total | 50,561 |
Gross Unrealized Losses |  |
Estimated Gross Unrealized Losses, In loss position for less than 12 months | (19) |
Gross Unrealized Losses, Total | (19) |
Maturity period for marketable securities |  |
Maximum contractual maturity period (in months) | 12 months |
Average contractual maturity period (in months) | 5 |
Available-for-sale securities and restricted and unrestricted cash |  |
Available-for-sale securities |  |
Amortized Cost | 235,734 | 304,312
Gross Unrealized Gains | 36 | 49
Gross Unrealized Losses | (19) | (16)
Estimated Fair Value | 235,751 | 304,345
U.S. government securities | Available-for-sale securities and restricted and unrestricted cash |  |
Available-for-sale securities |  |
Amortized Cost | 66,150 | 25,966
Gross Unrealized Gains | 24 | 10
Estimated Fair Value | 66,174 | 25,976
U.S. government agencies |  |
Fair Value |  |
Fair Value, In loss position for less than 12 months | 47,807 |
Fair Value, Total | 47,807 |
Gross Unrealized Losses |  |
Estimated Gross Unrealized Losses, In loss position for less than 12 months | (17) |
Gross Unrealized Losses, Total | (17) |
U.S. government agencies | Available-for-sale securities and restricted and unrestricted cash |  |
Available-for-sale securities |  |
Amortized Cost | 93,183 | 54,625
Gross Unrealized Gains | 9 | 30
Gross Unrealized Losses | (17) | (7)
Estimated Fair Value | 93,175 | 54,648
U.S. corporate notes |  |
Fair Value |  |
Fair Value, In loss position for less than 12 months | 2,754 |
Fair Value, Total | 2,754 |
Gross Unrealized Losses |  |
Estimated Gross Unrealized Losses, In loss position for less than 12 months | (2) |
Gross Unrealized Losses, Total | (2) |
U.S. corporate notes | Available-for-sale securities and restricted and unrestricted cash |  |
Available-for-sale securities |  |
Amortized Cost | 2,707 | 34,695
Gross Unrealized Gains |  | 9
Gross Unrealized Losses | (2) | (9)
Estimated Fair Value | 2,705 | 34,695
U.S. commercial paper | Available-for-sale securities and restricted and unrestricted cash |  |
Available-for-sale securities |  |
Amortized Cost | 34,973 | 97,221
Gross Unrealized Gains | 3 |
Estimated Fair Value | 34,976 | 97,221
Cash and money market funds | Available-for-sale securities and restricted and unrestricted cash |  |
Available-for-sale securities |  |
Amortized Cost | 38,721 | 91,805
Estimated Fair Value | $ 38,721 | $ 91,805

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- Definition This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a -Clause 2 -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 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a -Clause 2 -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. + Details
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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 Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash equivalents may be reported as cash equivalents, while legally restricted equivalents held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular equivalents are not generally reported as part of unrestricted cash equivalents. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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