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v3.3.1.900

Investments (Cost And Estimated Fair Value Of Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | $ 7,930 | $ 6,614 |
Gross unrealized gain | 0 | 1,238 |
Gross unrealized loss | 58 | 54 |
Fair value, investments | 7,872 | 7,798 |
Less cash equivalents, Carrying amount | 569 | 1,190 | $ 1,505
Money Market [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 246 | 510 |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 246 | 510 |
Commercial Paper [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 247 | 345 |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 0 | 0 |
Fair value, investments | 247 | 345 |
Treasury Bills [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 7,876 | 6,542 |
Gross unrealized gain | 0 | 0 |
Gross unrealized loss | 4 | 0 |
Fair value, investments | 7,872 | 6,542 |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 54 | 72 |
Gross unrealized gain | 0 | 1,238 |
Gross unrealized loss | 54 | 54 |
Fair value, investments | 0 | 1,256 |
Debt and Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cost | 8,423 | 7,469 |
Gross unrealized gain | 0 | 1,238 |
Gross unrealized loss | 58 | 54 |
Fair value, investments | 8,365 | 8,653 |
Less Cash and 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 | 493 | 855 |
Less cash equivalents, Fair value | $ 493 | $ 855 |

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