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Marketable Investment Securities, Restricted Cash and Other Investment Securities (Details 3) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Fair value of marketable investment securities in a loss position |  |
Total | $ 320,499 | $ 119,135
Less than Six Months | 316,580 | 26,358
Six to Nine Months |  | 17,566
Nine Months or More | 3,919 | 75,211
Unrealized loss on marketable investment securities in a loss position |  |
Less than Six Months | (2,962) | (44)
Six to Nine Months |  | (71)
Nine Months or More | (11) | (118)
Debt securities |  |
Fair value of marketable investment securities in a loss position |  |
Total | 320,499 | 119,135
Less than Six Months | 316,580 | 26,358
Six to Nine Months |  | 17,566
Nine Months or More | 3,919 | 75,211
Unrealized loss on marketable investment securities in a loss position |  |
Less than Six Months | (2,962) | (44)
Six to Nine Months |  | (71)
Nine Months or More | $ (11) | $ (118)

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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