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Fair Value Measurements (Fair Value Measurements On A Recurring Basis) (Details) (USD $)
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Jun. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2011
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Dec. 31, 2010
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|---|---|---|---|---|
| Cash and cash equivalents, Carrying amount | $ 5,634,000 | $ 5,476,000 | $ 490,000 | $ 583,000 |
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Equity Securities [Member]
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| Available-for-sale Securities, Carrying amount | 2,996,000 | 3,181,000 | ||
| Available-for-sale Securities, Fair Value | 2,996,000 | 3,181,000 | ||
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Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
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| Available-for-sale Securities, Fair Value | 2,996,000 | 3,181,000 | ||
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Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
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| Available-for-sale Securities, Fair Value | 0 | 0 | ||
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Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
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| Available-for-sale Securities, Fair Value | 0 | 0 | ||
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Commercial Paper [Member]
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| Cash and cash equivalents, Carrying amount | 5,447,000 | 5,373,000 | ||
| Cash and cash equivalents, Fair Value | 5,447,000 | 5,373,000 | ||
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Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
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| Cash and cash equivalents, Fair Value | 5,447,000 | 5,373,000 | ||
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Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
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| Cash and cash equivalents, Fair Value | 0 | 0 | ||
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Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member]
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| Cash and cash equivalents, Fair Value | $ 0 | $ 0 |