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Basis of Presentation and Summary of Significant Accounting Policies (Schedule of Unrealized Losses and Fair Values by Investment Category and Time in Continuous Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
Less than Twelve Months, Fair Value | $ 34,962
Less than 12 Months, Unrealized Losses | (93)
Twelve Months or More, Fair Value | 1,014
12 Months or More, Unrealized Losses | 0
Fair Value, Total | 35,976
Unrealized Losses, Total | (93)
U.S. Corporate Debt Securities |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
Less than Twelve Months, Fair Value | 26,728
Less than 12 Months, Unrealized Losses | (81)
Twelve Months or More, Fair Value | 1,014
12 Months or More, Unrealized Losses | 0
Fair Value, Total | 27,742
Unrealized Losses, Total | (81)
U.S. Government Agency Securities |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
Less than Twelve Months, Fair Value | 5,498
Less than 12 Months, Unrealized Losses | (10)
Twelve Months or More, Fair Value | 0
12 Months or More, Unrealized Losses | 0
Fair Value, Total | 5,498
Unrealized Losses, Total | (10)
U.S. Municipal Bonds |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
Less than Twelve Months, Fair Value | 2,736
Less than 12 Months, Unrealized Losses | (2)
Twelve Months or More, Fair Value | 0
12 Months or More, Unrealized Losses | 0
Fair Value, Total | 2,736
Unrealized Losses, Total | $ (2)

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