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Fair Value Disclosures (Details 2) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | $ 0 | $ 0
Fair Value, Level 2 to level 1 Transfers, Amount | 14,012,000 | 4,000
Availableforsale Securities Member |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 0 | 0
Fair Value, Level 2 to level 1 Transfers, Amount | 14,012,000 | 4,000
Corporate Debt Securities Member | Availableforsale Securities Member |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 0 | 0
Fair Value, Level 2 to level 1 Transfers, Amount | $ 14,012,000 | $ 4,000

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- Definition The amount of the transfers of assets or liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition The amount of the transfers of assets or liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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