Segments and Major Customers (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Major Customer Disclosure
Revenues	$ 78,288	$ 66,866
South Korea
Major Customer Disclosure
Revenues	26,853	22,025
USA
Major Customer Disclosure
Revenues	28,674	25,569
Japan
Major Customer Disclosure
Revenues	9,255	14,609
Europe
Major Customer Disclosure
Revenues	8,563	2,127
Canada
Major Customer Disclosure
Revenues	1,824	1,786
Asia-Other
Major Customer Disclosure
Revenues	$ 3,119	$ 750