Debt Long Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Senior Notes Due May 2018 [Member]	Dec. 31, 2013 Senior Notes Due May 2018 [Member]	Sep. 30, 2014 Senior Notes Due June 2021 [Member]	Dec. 31, 2013 Senior Notes Due June 2021 [Member]	Sep. 30, 2014 Senior Notes Due October 2022 [Member]	Dec. 31, 2013 Senior Notes Due October 2022 [Member]	Sep. 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]	Sep. 30, 2014 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due June 2016 [Member] Korea Subsidiaries [Member]	Sep. 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]	Sep. 30, 2014 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due July 2017 [Member] Korea Subsidiaries [Member]	Sep. 30, 2014 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due September 2017 [Member] Korea Subsidiaries [Member]	Sep. 30, 2014 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due December 2019 [Member] Korea Subsidiaries [Member]	Sep. 30, 2014 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Term Loan Due March 2015 [Member] Korea Subsidiaries [Member]	Sep. 30, 2014 Senior Secured Revolving Credit Facility due June 2017	Dec. 31, 2013 Senior Secured Revolving Credit Facility due June 2017	Sep. 30, 2014 Revolving Credit Facility Due June 2016 [Member] Korea Subsidiaries [Member]	Dec. 31, 2013 Revolving Credit Facility Due June 2016 [Member] Korea Subsidiaries [Member]	Sep. 30, 2014 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]	Dec. 31, 2013 Revolving Credit Facility Due April 2015 [Member] Taiwan Subsidiaries [Member]
Debt Instrument [Line Items]
Borrowing under credit facility																									$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Senior notes			345,000	345,000	400,000	400,000	525,000	525,000
Convertible senior subordinated notes									0	56,350	250,000
Subsidiary term loan												70,000	70,000	80,000	80,000	0	30,000	90,000	10,000	10,000	70,000	70,000	0	80,000
Long-term Debt, Gross	1,530,000	1,646,350
Add: Unamortized premium	5,969	6,390
Less: Short-term borrowings and current portion of long-term debt	(10,000)	(61,350)
Long-term debt (including related party)	$ 1,525,969	$ 1,591,390