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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investment In Organization [Line Items]        
Gain on sale of available-for-sale securities $ 0 $ 0 $ 0 $ 1,449
Rudolph Technologies, Inc [Member]        
Investment In Organization [Line Items]        
Investments owned, shares 0   0  
Available-for-sale shares sold       122,649
Gain on sale of available-for-sale securities       $ 1,447