Segments and Major Customers (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Major Customer Disclosure
Revenues	$ 76,518	$ 57,919	$ 154,806	$ 124,785
South Korea
Major Customer Disclosure
Revenues	26,946	22,502	53,799	44,527
USA
Major Customer Disclosure
Revenues	27,898	15,106	56,572	40,675
Japan
Major Customer Disclosure
Revenues	7,388	12,261	16,643	26,869
Europe
Major Customer Disclosure
Revenues	4,276	5,432	12,839	7,560
Canada
Major Customer Disclosure
Revenues	1,787	1,862	3,611	3,648
Asia-Other
Major Customer Disclosure
Revenues	$ 8,223	$ 756	$ 11,342	$ 1,506