|
Investments (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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|
| Investment In Organization [Line Items] | |||||
| Gain on sale of available-for-sale securities | $ 203 | $ 298 | $ 750 | $ 401 | |
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Rudolph Technologies, Inc [Member]
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| Investment In Organization [Line Items] | |||||
| Investments owned, shares | 163,917 | 163,917 | 231,336 | ||
| Aggregate value of shares | 1,619 | 1,619 | 2,716 | ||
| Approximate cost | 21 | 21 | 30 | ||
| Available-for-sale shares sold | 18,240 | 24,431 | 67,419 | 31,931 | |
| Gain on sale of available-for-sale securities | $ 203 | $ 297 | $ 750 | $ 400 | |