Debt - Short-term Borrowings and Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt including related party, gross	$ 1,525,305	$ 1,477,661
Less: Unamortized premium and deferred debt costs, net	(2,641)	(2,831)
Less: Short-term borrowings and current portion of long-term debt	(36,927)	(35,192)
Long-term debt (including related party)	1,485,737	1,439,638
$200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019 | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt including related party, gross	0	0
6.625% Senior notes, due June 2021 | Senior Notes
Debt Instrument [Line Items]
Long-term debt including related party, gross	400,000	400,000
6.375% Senior notes, due October 2022 | Senior Notes
Debt Instrument [Line Items]
Long-term debt including related party, gross	524,971	524,971
Korea | $100 million revolving credit facility, foreign currency funding-linked base rate plus 1.60%, due June 2017 | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt including related party, gross	0	0
Korea | Term loan, LIBOR plus 2.60%, due May 2018 | Subsidiary Term Loans
Debt Instrument [Line Items]
Long-term debt including related party, gross	120,000	120,000
Korea | Term loan, LIBOR plus 2.70%, due December 2019 | Subsidiary Term Loans
Debt Instrument [Line Items]
Long-term debt including related party, gross	55,000	55,000
Korea | Term loan, foreign currency funding-linked base rate plus 1.32%, due May 2020 | Subsidiary Term Loans
Debt Instrument [Line Items]
Long-term debt including related party, gross	150,000	150,000
Korea | Term loan, foreign currency funding-linked base rate plus 1.33%, due May 2020 | Subsidiary Term Loans
Debt Instrument [Line Items]
Long-term debt including related party, gross	80,000	80,000
Korea | Term loan, fund floating rate plus 1.60%, due June 2020 | Subsidiary Term Loans
Debt Instrument [Line Items]
Long-term debt including related party, gross	86,000	86,000
Japan | Short-term term loans, variable rate | Subsidiary Term Loans
Debt Instrument [Line Items]
Long-term debt including related party, gross	22,370	22,230
Japan | Term loans, fixed rate at 0.53%, due April 2018 | Subsidiary Term Loans
Debt Instrument [Line Items]
Long-term debt including related party, gross	16,964	19,460
Taiwan | Revolving credit facility, TAIFX plus a bank-determined spread, due November 2020 (Taiwan) | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Long-term debt including related party, gross	20,000	20,000
China | Term Loan, LIBOR plus 1.80%, due December 2019 (China)
Debt Instrument [Line Items]
Long-term debt including related party, gross	$ 50,000	$ 0