Investments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Investment In Organization [Line Items]
Gain on sale of available-for-sale securities	$ 634	$ 203	$ 1,449	$ 750
Rudolph Technologies, Inc [Member]
Investment In Organization [Line Items]
Investments owned, shares	0		0		122,649
Aggregate value of shares					$ 1,254
Approximate cost					$ 16
Available-for-sale shares sold	49,066	18,240	122,649	67,419
Gain on sale of available-for-sale securities	$ 632	$ 203	$ 1,447	$ 750

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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