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Segments and Major Customers (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Major Customer Disclosure |  |  |  |
Revenues | $ 72,812 | $ 76,518 | $ 145,726 | $ 154,806
South Korea |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 26,821 | 26,946 | 53,642 | 53,799
USA |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 29,677 | 27,898 | 57,384 | 56,572
Japan |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 7,915 | 7,388 | 16,406 | 16,643
Europe |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 1,540 | 4,276 | 6,715 | 12,839
Canada |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | 5 | 1,787 | 201 | 3,611
Asia-Other |  |  |  |
Major Customer Disclosure |  |  |  |
Revenues | $ 6,854 | $ 8,223 | $ 11,378 | $ 11,342

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