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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