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Investments (Cost And Estimated Fair Value Of Investments) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | $ 5,312,000 | $ 5,341,000 |
Gross unrealized gain | 2,687,000 | 3,639,000 |
Gross unrealized loss | 54,000 | 55,000 |
Fair value, investments | 7,945,000 | 8,925,000 |
Less cash equivalents, Carrying amount | 1,505,000 | 1,102,000 | 5,476,000
Money Market [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 540,000 | 804,000 |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 540,000 | 804,000 |
Commercial Paper [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 601,000 | 200,000 |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 601,000 | 200,000 |
Treasury Bills [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 5,226,000 | 5,249,000 |
Gross unrealized gain | 1,000 | 0 |
Gross unrealized loss | 0 | 1,000 |
Fair value, investments | 5,227,000 | 5,248,000 |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 86,000 | 92,000 |
Gross unrealized gain | 2,686,000 | 3,639,000 |
Gross unrealized loss | 54,000 | 54,000 |
Fair value, investments | 2,718,000 | 3,677,000 |
Debt and Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 6,453,000 | 6,345,000 |
Gross unrealized gain | 2,687,000 | 3,639,000 |
Gross unrealized loss | 54,000 | 55,000 |
Fair value, investments | 9,086,000 | 9,929,000 |
Less Cash Equivalents [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | 0 |
Less cash equivalents, Carrying amount | 1,141,000 | 1,004,000 |
Less cash equivalents, Fair value | $ 1,141,000 | $ 1,004,000 |

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