Debt (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	6 Months Ended								1 Months Ended					6 Months Ended			6 Months Ended			3 Months Ended	6 Months Ended				1 Months Ended	6 Months Ended			6 Months Ended		6 Months Ended		6 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Senior Notes Due May 2018 [Member]	Dec. 31, 2013 Senior Notes Due May 2018 [Member]	Jun. 30, 2014 Senior Notes Due June 2021 [Member]	Dec. 31, 2013 Senior Notes Due June 2021 [Member]	Jun. 30, 2014 Senior Notes Due October 2022 [Member]	Dec. 31, 2013 Senior Notes Due October 2022 [Member]	Apr. 30, 2014 Convertible Senior Subordinated Notes Due April 2014 [Member]	Jun. 30, 2013 Convertible Senior Subordinated Notes Due April 2014 [Member]	Jun. 30, 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]	Jun. 30, 2014 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Apr. 30, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member] Maximum [Member]	Jun. 30, 2014 Term Loan Due March 2017 [Member] Korea Subsidiaries [Member]	Mar. 31, 2014 Term Loan Due March 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due March 2017 [Member] Korea Subsidiaries [Member]	Jun. 30, 2012 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member]	Jun. 30, 2014 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member]	Jun. 30, 2014 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member] Minimum [Member]	Jun. 30, 2014 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, 2014 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Mar. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member] Maximum [Member]	Jun. 30, 2014 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Jun. 30, 2014 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Jun. 30, 2014 Senior Secured Revolving Credit Facility due June 2017	Jun. 30, 2014 Senior Secured Revolving Credit Facility due June 2017 Minimum [Member]	Jun. 30, 2014 Senior Secured Revolving Credit Facility due June 2017 Maximum [Member]	Jun. 30, 2014 Revolving Credit Facility Due June 2016 [Member] Korea Subsidiaries [Member]	Jun. 30, 2014 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Sep. 30, 2012 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Jun. 30, 2014 Related Party [Member] Senior Notes Due June 2021 [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			41,000,000		44,000,000
Repayments of Long-term Debt	140,000,000	0																			60,000,000
Debt Instrument Term																				5 years
Debt Instrument, Periodic Payment, Principal																									5,000,000
Debt, interest rate description														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%		foreign currency funding-linked rate plus 2.30%		LIBOR plus 1.5%-2.25%			foreign currency funding-linked base rate plus 2.00%	TAIFX plus a bank-determined spread
Debt Instrument, Interest Rate, Stated Percentage			7.375%				6.375%			6.00%	6.00%		6.00%	3.70%			2.00%				3.90%		3.90%	3.94%		1.75%			3.70%		2.30%			1.50%	2.25%	2.00%			6.625%
Debt Instrument, Convertible, Conversion Price													$ 3.02
Convertible senior subordinated notes											0	56,350,000	250,000,000
Face amount for related party																																							75,000,000
Debt Conversion, Original Debt, Amount									56,400,000	193,700,000
Debt Conversion, Converted Instrument, Shares Issued									18.6	64.0
Debt Instrument, Unused Borrowing Capacity, Amount														80,000,000		150,000,000										140,000,000		150,000,000
Loans Payable														70,000,000	70,000,000		80,000,000	80,000,000	0		30,000,000	90,000,000				10,000,000	10,000,000		70,000,000	70,000,000	0	80,000,000
Payments of Debt Exchange Costs	0	11,619,000								11,600,000
Interest rate for debt (percentage)														3.93%			3.58%				4.13%					3.38%
Current borrowing capacity																																					24,000,000
Line of Credit Facility, Step Down Provision																																						$ 5,000,000