Debt - Narrative (Details)	1 Months Ended					9 Months Ended
	Jul. 31, 2017 JPY (¥)	Jul. 31, 2017 USD ($)	Jun. 30, 2017 JPY (¥)	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 JPY (¥)	Sep. 30, 2017 USD ($)	Jul. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2015 USD ($)	May 31, 2015 USD ($)
Debt Instrument [Line Items]
Long-term debt including related party, gross									$ 1,362,881,000		$ 1,477,661,000
Long-term debt, related party									0		75,000,000
Proceeds from lines of credit						$ 75,000,000	$ 115,000,000
Proceeds from issuance of long-term debt						$ 223,976,000	$ 45,000,000
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)								3.11%	3.11%
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%
Redemption notice, amount to be redeemed		$ 200,000,000
Long-term debt including related party, gross									$ 200,000,000		400,000,000
Current portion of long-term debt, related party										$ 17,500,000
Redemption price (as a percent)	101.656%	101.656%
Loss on premium paid for retirement of debt		$ 3,300,000
Write off of Deferred Debt Issuance Cost		$ 1,100,000
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)								3.20%	3.20%
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									11,600,000
Long-term debt including related party, gross									$ 21,180,000		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									$ 10,124,000		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									$ 42,218,000		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
Subsidiary Term Loans | Japan | Term loan, fixed rate at 0.60%, due July 2022
Debt Instrument [Line Items]
Stated interest rate (as a percent)	0.60%							0.60%	0.60%	0.60%
Long-term debt including related party, gross									$ 8,888,000		0
Amount of debt agreement | ¥	¥ 1,000,000,000.0
Periodic principal payment | ¥	50,000,000
Proceeds from issuance of long-term debt | ¥	¥ 1,000,000,000
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									200,000,000.0
Remaining borrowing capacity									199,500,000
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
Interest rate at period end (as a percent)								3.75%	3.75%
Proceeds from lines of credit				$ 75,000,000
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)								2.64%	2.64%
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)						0.15%
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)						0.24%
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%