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Other Income (expense) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Foreign exchange gain (loss) $ 717,000 $ (999,000) $ (1,253,000)
Gain on sales of investments 859,000 1,263,000  
Other income (expense) 447,000 97,000 505,000
Other income (expense), net 2,023,000 361,000 $ (748,000)
Foreign Exchange Contract [Member]      
Outstanding commitments on foreign exchange contracts $ 36,000 $ 0