Debt - Narrative (Details)	1 Months Ended				6 Months Ended
	Jun. 30, 2017 JPY (¥)	Jun. 30, 2017 USD ($)	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2015 USD ($)	May 31, 2015 USD ($)
Debt Instrument [Line Items]
Current portion of long-term debt, related party							$ 17,546,000	$ 0
Long-term debt including related party, gross							1,570,694,000	1,477,661,000
Proceeds from lines of credit					$ 75,000,000	$ 115,000,000
Proceeds from issuance of long-term debt					$ 215,086,000	$ 34,000,000
China | Term Loan, LIBOR plus 1.80%, due December 2019 (China)
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.80%
Long-term debt including related party, gross							$ 49,500,000	0
Interest rate at period end (as a percent)	2.96%						2.96%
Amount of debt agreement								50,000,000
Periodic principal payment					$ 500,000
Proceeds from issuance of long-term debt				$ 50,000,000
Senior Notes | 6.625% Senior notes, due June 2021
Debt Instrument [Line Items]
Stated interest rate (as a percent)	6.625%						6.625%
Current portion of long-term debt, related party							$ 17,500,000
Redemption notice, amount to be redeemed							200,000,000
Long-term debt including related party, gross							$ 400,000,000	400,000,000
Redemption price (as a percent)	101.656%	101.656%
Debt extinguishment costs		$ 4,000,000
Senior Notes | 6.375% Senior notes, due October 2022
Debt Instrument [Line Items]
Stated interest rate (as a percent)	6.375%						6.375%
Long-term debt including related party, gross							$ 524,971,000	524,971,000
Term Loan | Korea | Term loan, fixed rate at 3.70%, due May 2020
Debt Instrument [Line Items]
Stated interest rate (as a percent)	3.70%						3.70%
Long-term debt including related party, gross							$ 120,000,000	0
Term Loan | Korea | Term loan, foreign currency funding-linked base rate plus 1.33%, due May 2020
Debt Instrument [Line Items]
Long-term debt including related party, gross							0	80,000,000
Repayments of debt			$ 80,000,000
Subsidiary Term Loans | Korea | Term loan, LIBOR plus 2.70%, due December 2019
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					2.70%
Long-term debt including related party, gross							55,000,000	55,000,000
Subsidiary Term Loans | Korea | Term loan, foreign currency funding-linked base rate plus 1.32%, due May 2020
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.32%
Long-term debt including related party, gross							150,000,000	150,000,000
Subsidiary Term Loans | Korea | Term loan, fund floating rate plus 1.60%, due June 2020
Debt Instrument [Line Items]
Credit facility, borrowing capacity										$ 150,000,000
Basis spread on variable rate (as a percent)					1.60%
Remaining borrowing capacity							64,000,000
Long-term debt including related party, gross							$ 86,000,000	86,000,000
Interest rate at period end (as a percent)	3.08%						3.08%
Subsidiary Term Loans | Korea | Term loan, LIBOR plus 2.60%, due May 2018
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					2.60%
Long-term debt including related party, gross							$ 0	120,000,000
Subsidiary Term Loans | Korea | Term loan, foreign currency funding-linked base rate plus 1.33%, due May 2020
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.33%
Subsidiary Term Loans | Japan | Short-term term loans, variable rate
Debt Instrument [Line Items]
Remaining borrowing capacity							3,600,000
Long-term debt including related party, gross							$ 32,094,000	22,230,000
Subsidiary Term Loans | Japan | Term loans, fixed rate at 0.53%, due April 2018
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.53%						0.53%
Long-term debt including related party, gross							$ 13,538,000	19,460,000
Subsidiary Term Loans | Japan | Term loan, fixed rate at 0.86%, due June 2022
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.86%						0.86%
Long-term debt including related party, gross							$ 44,591,000	0
Amount of debt agreement | ¥	¥ 5,000,000,000.0
Periodic principal payment | ¥	250,000,000
Proceeds from issuance of long-term debt | ¥	¥ 5,000,000,000
Revolving Credit Facility | Line of Credit | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019
Debt Instrument [Line Items]
Credit facility, borrowing capacity							200,000,000
Remaining borrowing capacity							182,900,000
Long-term debt including related party, gross							0	0
Revolving Credit Facility | Line of Credit | Korea | $75 million revolving credit facility, foreign currency funding-linked base rate plus 1.60%, due June 2018
Debt Instrument [Line Items]
Credit facility, borrowing capacity							75,000,000
Basis spread on variable rate (as a percent)					1.60%
Long-term debt including related party, gross			100,000,000				$ 75,000,000	0
Proceeds from lines of credit			$ 75,000,000
Interest rate at period end (as a percent)	3.71%						3.71%
Revolving Credit Facility | Line of Credit | Taiwan | Revolving credit facility, TAIFX plus a bank-determined spread, due November 2020 (Taiwan)
Debt Instrument [Line Items]
Credit facility, borrowing capacity									$ 39,000,000
Remaining borrowing capacity							$ 19,000,000
Long-term debt including related party, gross							$ 20,000,000	$ 20,000,000
Interest rate at period end (as a percent)	2.51%						2.51%
Letter of Credit
Debt Instrument [Line Items]
Standby letters of credit outstanding							$ 500,000
Letter of Credit | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019
Debt Instrument [Line Items]
Credit facility, borrowing capacity							$ 25,000,000.0
Minimum | Revolving Credit Facility | Line of Credit | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.25%
Maximum | Revolving Credit Facility | Line of Credit | $200 million revolving credit facility, LIBOR plus 1.25%-1.75%, due December 2019
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.75%
TIBOR | Minimum | Subsidiary Term Loans | Japan | Short-term term loans, variable rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.22%
TIBOR | Maximum | Subsidiary Term Loans | Japan | Short-term term loans, variable rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.38%
TIBOR | Weighted Average | Subsidiary Term Loans | Japan | Short-term term loans, variable rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					0.30%
LIBOR | China | Term Loan, LIBOR plus 1.80%, due December 2019 (China)
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.80%