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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Summary of available-for-sale securities |  |
Available-for-sale securities, Cost | $ 68,483 | $ 68,164
Available-for-sale securities, Estimated Fair Value | 69,035 | 68,566
Level 1 [Member] | Certificates of deposit [Member] |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 1,902 | 3,646
Unrecognized losses for less than 12 months, Estimated Fair value | 1,893 | 3,605
Unrecognized losses for more than 12 months, Cost | 103 |
Unrecognized losses for more than 12 months, Estimated Fair value | 103 |
Unrecognized gains, Cost | 4,324 | 3,525
Unrecognized gains, Estimated Fair value | 4,360 | 3,551
Available-for-sale securities, Cost | 6,329 | 7,171
Available-for-sale securities, Estimated Fair Value | 6,356 | 7,156
Level 2 [Member] | U.S. Treasury and agency notes [Member] |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 6,293 | 4,352
Unrecognized losses for less than 12 months, Estimated Fair value | 6,236 | 4,338
Unrecognized losses for more than 12 months, Cost |  | 1,002
Unrecognized losses for more than 12 months, Estimated Fair value |  | 1,000
Unrecognized gains, Cost | 14,723 | 16,479
Unrecognized gains, Estimated Fair value | 14,844 | 16,660
Available-for-sale securities, Cost | 21,016 | 21,833
Available-for-sale securities, Estimated Fair Value | 21,080 | 21,998
Level 2 [Member] | Corporate notes [Member] |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 4,739 | 9,230
Unrecognized losses for less than 12 months, Estimated Fair value | 4,707 | 9,098
Unrecognized losses for more than 12 months, Cost | 821 | 1,539
Unrecognized losses for more than 12 months, Estimated Fair value | 818 | 1,494
Unrecognized gains, Cost | 26,052 | 19,369
Unrecognized gains, Estimated Fair value | 26,460 | 19,738
Available-for-sale securities, Cost | 31,612 | 30,138
Available-for-sale securities, Estimated Fair Value | 31,985 | 30,330
Level 2 [Member] | Municipal notes [Member] |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 1,058 | 1,177
Unrecognized losses for less than 12 months, Estimated Fair value | 1,048 | 1,165
Unrecognized losses for more than 12 months, Cost | 952 | 881
Unrecognized losses for more than 12 months, Estimated Fair value | 944 | 873
Unrecognized gains, Cost | 7,516 | 6,964
Unrecognized gains, Estimated Fair value | 7,622 | 7,044
Available-for-sale securities, Cost | 9,526 | 9,022
Available-for-sale securities, Estimated Fair Value | $ 9,614 | $ 9,082

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