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Segments and Major Customers (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Major Customer Disclosure    
Revenues $ 97,351 $ 72,682
South Korea    
Major Customer Disclosure    
Revenues 28,969 31,454
USA    
Major Customer Disclosure    
Revenues 38,438 25,265
Japan    
Major Customer Disclosure    
Revenues 6,518 4,987
Europe    
Major Customer Disclosure    
Revenues 4,438 3,793
Canada    
Major Customer Disclosure    
Revenues 1,068 214
SINGAPORE    
Major Customer Disclosure    
Revenues 7,747 4,619
Asia-Other    
Major Customer Disclosure    
Revenues $ 10,173 $ 2,350