Debt Long Term Debt (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Senior Notes Due May 2018 [Member]	Dec. 31, 2012 Senior Notes Due May 2018 [Member]	Sep. 30, 2013 Senior Notes Due June 2021 [Member]	Dec. 31, 2012 Senior Notes Due June 2021 [Member]	Sep. 30, 2013 Senior Notes Due October 2022 [Member]	Dec. 31, 2012 Senior Notes Due October 2022 [Member]	Sep. 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]	Sep. 30, 2013 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Sep. 30, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Apr. 30, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Sep. 30, 2013 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member]	Sep. 30, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Mar. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Sep. 30, 2013 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Dec. 31, 2012 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Nov. 30, 2012 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Sep. 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]	Sep. 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]	Sep. 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]
Debt Instrument [Line Items]
Basis spread on variable rate (percentage)												2.30%		3.80%	3.80%				1.75%	1.75%		3.70%		3.70%			2.00%
Borrowing under credit facility																									$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Long-term Debt, Gross	1,644,350,000	1,545,000,000
Senior notes			345,000,000	345,000,000	400,000,000	400,000,000	525,000,000	300,000,000
Convertible subordinated notes									56,350,000	250,000,000	250,000,000
Subsidiary term loan												100,000,000	100,000,000	10,000,000		0	150,000,000	137,000,000	10,000,000		0	48,000,000	13,000,000
Long-term and short-term debt	1,650,877,000	1,545,000,000
Add: Unamortized premium	6,527,000	0
Less: Short-term borrowings and current portion of long-term debt	(56,350,000)	0
Long-term debt (including related party)	$ 1,594,527,000	$ 1,545,000,000