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N. SEGMENT AND GEOGRAPHIC INFORMATION - LONG LIVED ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Long-lived assets $ 148,869 $ 114,453 $ 69,571
UNITED STATES      
Long-lived assets 66,028 44,280 15,875
TAIWAN, PROVINCE OF CHINA      
Long-lived assets 48,728 45,420 35,688
CHINA      
Long-lived assets $ 34,113 $ 24,753 $ 18,008