Debt (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended			1 Months Ended									1 Months Ended			1 Months Ended		6 Months Ended	1 Months Ended	6 Months Ended				1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended					6 Months Ended			6 Months Ended				3 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jan. 31, 2012 Korea Subsidiaries [Member]	Jun. 30, 2013 Senior Notes Due May 2018 [Member]	Dec. 31, 2012 Senior Notes Due May 2018 [Member]	Jun. 30, 2013 Senior Notes Due June 2021 [Member]	Dec. 31, 2012 Senior Notes Due June 2021 [Member]	Jun. 30, 2013 Senior Notes Due June 2021 [Member] Related Party [Member]	Jun. 30, 2013 Senior Notes Due October 2022 [Member]	Dec. 31, 2012 Senior Notes Due October 2022 [Member]	Sep. 30, 2012 Senior Notes Due October 2022 [Member]	Jun. 30, 2013 Convertible Senior Subordinated Notes Due April 2014 [Member]	Dec. 31, 2012 Convertible Senior Subordinated Notes Due April 2014 [Member]	Apr. 30, 2009 Convertible Senior Subordinated Notes Due April 2014 [Member]	Jun. 30, 2013 Convertible Senior Subordinated Notes Due April 2014 [Member] Related Party [Member]	Apr. 30, 2009 Convertible Senior Subordinated Notes Due April 2014 [Member] Related Party [Member]	Jun. 30, 2013 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Apr. 30, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Jun. 30, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Jun. 30, 2013 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member]	Jun. 30, 2013 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member] Minimum [Member]	Jun. 30, 2013 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member] Maximum [Member]	Mar. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Jun. 30, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Nov. 30, 2012 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Jun. 30, 2013 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Jun. 30, 2013 $150 million revolving credit facility, LIBOR plus 1.5%-2.25%, due June 2017 [Member]	Dec. 31, 2012 $150 million revolving credit facility, LIBOR plus 1.5%-2.25%, due June 2017 [Member]	Jun. 30, 2013 $150 million revolving credit facility, LIBOR plus 1.5%-2.25%, due June 2017 [Member] Minimum [Member]	Jun. 30, 2013 $150 million revolving credit facility, LIBOR plus 1.5%-2.25%, due June 2017 [Member] Maximum [Member]	Jun. 30, 2013 Revolving Credit Facility 2.00% due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Revolving Credit Facility 2.00% due June 2016 [Member] Korea Subsidiaries [Member]	Jun. 30, 2012 Revolving Credit Facility 2.00% due June 2016 [Member] Korea Subsidiaries [Member]	Jun. 30, 2013 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Dec. 31, 2012 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Sep. 30, 2012 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Sep. 30, 2012 Senior Notes Due October 2022 First Issue [Member] Senior Notes Due October 2022 [Member]	Jun. 30, 2013 Senior Notes Due October 2022 Second Issue [Member] Senior Notes Due October 2022 [Member]	May 31, 2013 Senior Notes Due October 2022 Second Issue [Member] Senior Notes Due October 2022 [Member]
Debt Instrument [Line Items]
Senior notes								$ 345,000,000	$ 345,000,000	$ 400,000,000	$ 400,000,000		$ 525,000,000	$ 300,000,000																											$ 300,000,000		$ 225,000,000
Debt Instruments [Abstract]
Credit facility, borrowing capacity																						150,000,000					150,000,000		100,000,000		150,000,000				41,000,000		41,000,000			44,000,000
Debt Instrument Term							12 months															3 years							7 years
Debt Instrument, Periodic Payment, Principal																											5,000,000
Basis spread on variable rate (percentage)																					2.30%	3.80%	3.80%		3.90%	3.94%	1.75%	1.75%	3.70%	3.70%			1.50%	2.25%	2.00%
Debt, interest rate description																					foreign currency funding-linked rate plus 2.30%		LIBOR plus 3.80%	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%		6.375%	6.00%		6.00%
Debt Instrument, Convertible, Conversion Price (in dollars per share)																		$ 3.02
Debt Instrument, Unamortized Premium Percentage																																											103.00%
Debt Instrument, Unamortized Premium	6,661,000	6,661,000		6,661,000		0																																					6,800,000
Debt Issuance Cost																																										3,400,000
Convertible Subordinated Debt																56,350,000	250,000,000	250,000,000
Face amount for related party												75,000,000								150,000,000
Debt Conversion, Original Debt, Amount																193,700,000			150,000,000
Payments of Debt Exchange Costs	11,600,000
Common stock issuance for exchange of 6.0% convertible senior subordinated notes due April 2014, $150 million related party				193,650,000	0
Debt Conversion, Converted Instrument, Shares Issued																64.0
Loss on debt retirement, net		(11,619,000)	0	(11,619,000)	0
Interest rate for debt (percentage)																							4.07%					3.85%		3.98%					3.97%
Borrowings outstanding																															0	0			0	0		0	0
Current borrowing capacity																							140,000,000					140,000,000		52,000,000					41,000,000			34,000,000
Line of Credit Facility, Step Down Provision																																								$ 5,000,000