Debt (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended													3 Months Ended			3 Months Ended				1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended			3 Months Ended		3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Senior Notes Due May 2018 [Member]	Dec. 31, 2013 Senior Notes Due May 2018 [Member]	Mar. 31, 2014 Senior Notes Due June 2021 [Member]	Dec. 31, 2013 Senior Notes Due June 2021 [Member]	Mar. 31, 2014 Senior Notes Due June 2021 [Member] Related Party [Member]	Mar. 31, 2014 Senior Notes Due October 2022 [Member]	Dec. 31, 2013 Senior Notes Due October 2022 [Member]	Mar. 31, 2014 Convertible Senior Subordinated Notes Due April 2014 [Member]	Dec. 31, 2013 Convertible Senior Subordinated Notes Due April 2014 [Member]	Apr. 30, 2009 Convertible Senior Subordinated Notes Due April 2014 [Member]	Mar. 31, 2014 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Mar. 31, 2014 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Apr. 30, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Mar. 31, 2014 Term Loan Due March 2017 [Member] Korea Subsidiaries [Member]	Mar. 31, 2014 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member]	Mar. 31, 2014 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member] Minimum [Member]	Mar. 31, 2014 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member] Maximum [Member]	Mar. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Mar. 31, 2014 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Mar. 31, 2014 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Apr. 30, 2014 Subsequent Event [Member] Convertible Senior Subordinated Notes Due April 2014 [Member]	Mar. 31, 2014 Senior Secured Revolving Credit Facility due June 2017	Dec. 31, 2013 Senior Secured Revolving Credit Facility due June 2017	Mar. 31, 2014 Senior Secured Revolving Credit Facility due June 2017 Minimum [Member]	Mar. 31, 2014 Revolving Credit Facility Due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Revolving Credit Facility Due June 2016 [Member] Korea Subsidiaries [Member]	Mar. 31, 2014 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Dec. 31, 2013 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Sep. 30, 2012 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Mar. 31, 2014 Senior Secured Revolving Credit Facility due June 2017 Maximum [Member]
Debt Instrument [Line Items]
Senior notes				$ 345,000,000	$ 345,000,000	$ 400,000,000	$ 400,000,000		$ 525,000,000	$ 525,000,000
Credit facility, borrowing capacity																150,000,000	80,000,000				150,000,000				150,000,000			41,000,000				44,000,000
Repayments of Long-term Debt	80,000,000	0																60,000,000
Debt Instrument Term																		5 years
Debt Instrument, Periodic Payment, Principal																					5,000,000
Debt, interest rate description														foreign currency funding-linked rate plus 2.30%	LIBOR plus 3.70%		foreign currency funding-linked base rate plus 2.00%	LIBOR plus 3.90% or 3.94%				foreign currency funding-linked base rate plus 1.75%	LIBOR plus 3.70%		LIBOR plus 1.5%-2.25%			foreign currency funding-linked base rate plus 2.00%		TAIFX plus a bank-determined spread
Interest rate on convertible senior subordinated notes due April 2014				7.375%				6.625%	6.375%		6.00%		6.00%	2.30%	3.70%		2.00%		3.90%	3.94%		1.75%	3.70%				1.50%	2.00%					2.25%
Debt Instrument, Unamortized Premium	6,252,000		6,390,000
Convertible senior subordinated notes											56,350,000	56,350,000
Face amount for related party								75,000,000
Debt Conversion, Original Debt, Amount																								56,400,000
Debt Conversion, Converted Instrument, Shares Issued																								18.6
Interest rate for debt (percentage)															3.93%		3.63%					3.43%
Borrowings outstanding																									0	0		0	0	0	0
Current borrowing capacity															80,000,000							140,000,000								29,000,000
Line of Credit Facility, Step Down Provision																																$ 5,000,000