Debt (Details)	3 Months Ended						3 Months Ended								3 Months Ended				3 Months Ended		3 Months Ended		3 Months Ended
	Mar. 31, 2012 Korean Subsidiary [Member] USD ($)	Mar. 31, 2012 Term Loan Due April 2015 [Member] Taiwan Subsidiaries [Member] TWD	Jan. 31, 2012 Term Loan Due April 2015 [Member] Taiwan Subsidiaries [Member] USD ($)	Mar. 31, 2012 Senior Notes Due May 2018 [Member]	Mar. 31, 2012 Senior Notes Due 2021 [Member] Related Party [Member] USD ($)	Mar. 31, 2012 Convertible Senior Subordinated Notes Due April 2014 [Member] Related Party [Member] USD ($)	Mar. 31, 2012 Term Loan Due April 2014 [Member] Korea Subsidiaries [Member]	Mar. 31, 2012 Term Loan Due May 2013 [Member] Korea Subsidiaries [Member]	Mar. 31, 2012 Term Loan TIBOR Due September 2012 [Member] Japan Subsidiaries [Member]	Mar. 31, 2012 Term Loan Bank Sinking Fund Due Mar 2016 [Member] Korea Subsidiaries [Member]	Mar. 31, 2012 Term Loan Due July 2014 [Member] Korea Subsidiaries [Member]	Mar. 31, 2012 Term Loan Due July 2014 [Member] Korea Subsidiaries [Member] Minimum [Member]	Mar. 31, 2012 Term Loan Due July 2014 [Member] Korea Subsidiaries [Member] Maximum [Member]	Mar. 31, 2012 Term Loan Due March 2015 [Member] Korean Subsidiary [Member]	Mar. 31, 2012 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Mar. 31, 2012 Revolving Credit Facility .6% due September 2012 [Member] Japan Subsidiaries [Member] JPY (¥)	Mar. 31, 2012 $100 million revolving credit facility, LIBOR plus 2.25%-2.75%, due April 2015 [Member] USD ($)	Mar. 31, 2012 $100 million revolving credit facility, LIBOR plus 2.25%-2.75%, due April 2015 [Member] Minimum [Member]	Mar. 31, 2012 $100 million revolving credit facility, LIBOR plus 2.25%-2.75%, due April 2015 [Member] Maximum [Member]	Mar. 31, 2012 Working Capital Facility Due January 2013 And April 2012 Member Korea Subsidiaries [Member] KRW	Mar. 31, 2012 Working Capital Facility Due January 2013 And April 2012 Member China Subsidiaries [Member]	Mar. 31, 2012 Letter of Credit [Member] USD ($)	Mar. 31, 2012 Revolving Credit Facility 2.20% Due June 2012 [Member] Korea Subsidiaries [Member]
Debt Instruments [Abstract]
Debt Instrument, Basis Spread on Variable Rate		0.20%					0.50%	1.99%	0.80%	1.70%		1.06%	1.16%		2.30%	0.60%		2.50%	2.75%		2.80%		2.20%
Debt, interest rate terms		TAIFX plus .02%					bank base rate + 0.5%	bank funding rate-linked base rate + 1.99%	TIBOR + 0.8%	Rate-linked base rate plus 1.7%	bank base rate plus 1.06% or 1.16%				foreign currency funding-linked rate plus 2.30%	TIBOR + 0.6%			LIBOR plus 2.25%-2.75%		LIBOR plus 2.8%		at the CD base interest rate plus 2.20%
Interest rate on convertible notes due				7.375%	6.625%	6.00%
Face amount for related party					$ 75,000,000	$ 150,000,000
Credit facility, borrowing capacity			50,000,000													1,000,000,000	100,000,000			50,000,000,000		25,000,000
Debt (Textuals) [Abstract]
Remaining outstanding balance	100,000,000
Description of foreign currency loan	foreign currency funding-linked base rate
Foreign currency funding-linked base rate														2.30%
Interest rate		3.35%												5.47%
Term loan with Taiwanese Bank due April 2015 and Term Loan with Woori Bank for 12 months		1,500,000,000
Credit facility, borrowing capacity			$ 50,000,000													¥ 1,000,000,000	$ 100,000,000			50,000,000,000		$ 25,000,000
Description of variable rate basis		Taipei Foreign Exchange ("TAIFX") six month U.S. dollar rate
Basis spread on variable rate		2.00%