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Segments and Major Customers (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Major Customer Disclosure        
Revenues $ 69,712 $ 73,294 $ 224,518 $ 198,079
South Korea
       
Major Customer Disclosure        
Revenues 26,821 34,343 80,620 78,871
USA
       
Major Customer Disclosure        
Revenues 24,950 15,880 81,522 56,555
Japan
       
Major Customer Disclosure        
Revenues 6,497 15,943 23,140 42,812
Europe
       
Major Customer Disclosure        
Revenues 4,238 4,098 17,077 11,658
Canada
       
Major Customer Disclosure        
Revenues 1,754 2,280 5,365 5,928
Asia-Other
       
Major Customer Disclosure        
Revenues $ 5,452 $ 750 $ 16,794 $ 2,255