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Segments and Major Customers (Details 3) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Major Customer Disclosure    
Revenues $ 72,682 $ 72,914
South Korea    
Major Customer Disclosure    
Revenues 31,454 26,821
USA    
Major Customer Disclosure    
Revenues 25,265 27,707
Japan    
Major Customer Disclosure    
Revenues 4,987 8,491
Europe    
Major Customer Disclosure    
Revenues 3,793 5,175
Canada    
Major Customer Disclosure    
Revenues 214 196
SINGAPORE    
Major Customer Disclosure    
Revenues 4,619 2,810
Asia-Other    
Major Customer Disclosure    
Revenues $ 2,350 $ 1,714