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Marketable Investments (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Summary of the gross unrealized losses and market value of available for sale securities with unrealized losses |  |
Available for sale securities, Less Than 12 Months, Market Value | $ 27,146 | $ 71,725
Available for sale securities, Less Than 12 Months, Unrealized Losses | 43 | 322
Available for sale securities, 12 Months or Greater, Market Value | 8,970 | 12,715
Available for sale securities, 12 Months or Greater, Unrealized Losses | 2,030 | 1,460
State and municipal bonds [Member] |  |
Summary of the gross unrealized losses and market value of available for sale securities with unrealized losses |  |
Available for sale securities, Less Than 12 Months, Market Value | 9,430 | 2,763
Available for sale securities, Less Than 12 Months, Unrealized Losses | 14 | 9
Available for sale securities, 12 Months or Greater, Market Value |  | 1,107
Available for sale securities, 12 Months or Greater, Unrealized Losses |  | 3
Federal agency and corporate obligations [Member] |  |
Summary of the gross unrealized losses and market value of available for sale securities with unrealized losses |  |
Available for sale securities, Less Than 12 Months, Market Value | 17,716 | 68,962
Available for sale securities, Less Than 12 Months, Unrealized Losses | 29 | 313
Available for sale securities, 12 Months or Greater, Market Value |  | 2,043
Available for sale securities, 12 Months or Greater, Unrealized Losses |  | 22
ARS [Member] |  |
Summary of the gross unrealized losses and market value of available for sale securities with unrealized losses |  |
Available for sale securities, Less Than 12 Months, Market Value |  |
Available for sale securities, Less Than 12 Months, Unrealized Losses |  |
Available for sale securities, 12 Months or Greater, Market Value | 8,970 | 9,565
Available for sale securities, 12 Months or Greater, Unrealized Losses | $ 2,030 | $ 1,435

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- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: 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 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 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + 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 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)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 4: 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. + Details
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