Segments and Major Customers (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Major Customer Disclosure
Revenue	$ 73,422	$ 73,294	$ 57,919	$ 66,866	$ 57,443	$ 57,530	$ 56,215	$ 62,863	$ 271,501	$ 234,051	$ 312,363
Property, plant and equipment, net	72,642				86,905				72,642	86,905
South Korea
Major Customer Disclosure
Revenue									112,806	88,971	94,197
USA
Major Customer Disclosure
Revenue									80,652	63,398	103,367
Property, plant and equipment, net	71,800				85,800				71,800	85,800
Japan
Major Customer Disclosure
Revenue									51,156	63,686	97,726
Europe
Major Customer Disclosure
Revenue									15,985	5,236	1,992
Canada
Major Customer Disclosure
Revenue									7,896	7,759	14,750
Asia-Other
Major Customer Disclosure
Revenue									3,006	5,001	331
India
Major Customer Disclosure
Property, plant and equipment, net	700				1,000				700	1,000
Other foreign locations
Major Customer Disclosure
Property, plant and equipment, net	$ 100				$ 100				$ 100	$ 100