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Debt - Schedule of Debt (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
Oct. 28, 2025
Dec. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2025
KRW (₩)
May 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
May 31, 2024
USD ($)
borrowing
May 31, 2024
KRW (₩)
borrowing
Apr. 30, 2021
KRW (₩)
borrowing
Debt Instrument [Line Items]                        
Total debt     $ 1,823,783     $ 1,823,783     $ 1,164,462      
Less: Unamortized discount and deferred debt costs, net     (11,835)     (11,835)     (5,002)      
Less: Short-term borrowings and current portion of long-term debt     (547,447)     (547,447)     (236,029)      
Long-term debt     1,264,501     1,264,501     923,431      
Short-term term loans, variable rate | Japan | Subsidiary Term Loans                        
Debt Instrument [Line Items]                        
Total debt     0     0     0      
Borrowing capacity available     $ 3,400     $ 3,400            
Senior Notes | 6.625% Senior notes, due September 2027                        
Debt Instrument [Line Items]                        
Interest rate (as a percent) 6.625%   6.625%     6.625% 6.625%          
Total debt     $ 400,000     $ 400,000     525,000      
Early redemption of senior debt $ 125,000                      
Payment for debt prepayment     $ 500                  
Senior Notes | 6.625% Senior notes, due September 2027 | Subsequent Event                        
Debt Instrument [Line Items]                        
Debt instrument, redemption price, percent       100.00%                
Senior Notes | 6.625% Senior notes, due September 2027 | Forecast                        
Debt Instrument [Line Items]                        
Payment for debt prepayment         $ 1,800              
Senior Notes | 5.875% Senior notes, due October 2033                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     5.875%     5.875% 5.875%          
Total debt     $ 500,000     $ 500,000     0      
Face amount of debt     500,000     500,000            
Debt issuance costs     $ 6,700     $ 6,700            
Line of Credit | 2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     1.75%     1.75% 1.75%          
Total debt     $ 0     $ 0     0      
Line of Credit | 2025 Revolving Credit Facility, applicable bank rate plus 1.75%, due May 2030 | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Credit facility, borrowing capacity               $ 1,000,000        
Increase in maximum borrowing capacity amount               $ 200,000        
Current borrowing capacity     $ 1,000,000     $ 1,000,000            
Term Loan | Term A Loans, applicable bank rate plus 1.75%, 6.05% as of June 30, 2025, due May 2030                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     1.75%     1.75% 1.75%          
Effective interest rate (as a percent)     5.74%     5.74% 5.74%          
Total debt     $ 500,000     $ 500,000     0      
Face amount of debt   $ 500,000                    
Percentage amortization of original principal amount, years one and two   2.50%                    
Percentage amortization of original principal amount, thereafter   5.00%                    
Term Loan | Term A Loan Due 2033                        
Debt Instrument [Line Items]                        
Total debt $ 500,000                      
Subsidiary Term Loans | Term loan, fixed rate at 3.95%, due May 2027 | Korea                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     3.95%     3.95% 3.95%          
Total debt     $ 0     $ 0     0      
Number of annual borrowings | borrowing                   6 6 6
Borrowing capacity available     $ 57,000     $ 57,000 ₩ 80,000,000,000          
Subsidiary Term Loans | Term loan, fixed rate at 2.12%, due December 2028 | Korea                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     2.12%     2.12% 2.12%          
Total debt     $ 175,000     $ 175,000     200,000      
Subsidiary Term Loans | Term loan, fixed rate at 1.20%, due December 2025 | Japan                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     1.20%     1.20% 1.20%          
Total debt     $ 3,685     $ 3,685     13,868      
Subsidiary Term Loans | Term loan, fixed rate at 1.23%, due December 2026 | Japan                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     1.23%     1.23% 1.23%          
Total debt     $ 22,143     $ 22,143     33,333      
Subsidiary Term Loans | Term loan, fixed rate at 1.59%, due December 2027 | Japan                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     1.59%     1.59% 1.59%          
Total debt     $ 47,769     $ 47,769     59,923      
Subsidiary Term Loans | Term loan, fixed rate at 1.80%, due December 2028 | Japan                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     1.80%     1.80% 1.80%          
Total debt     $ 76,910     $ 76,910     89,059      
Subsidiary Term Loans | Term loan, fixed rate at 2.05%, due December 2029 | Japan                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     2.05%     2.05% 2.05%          
Total debt     $ 98,276     $ 98,276     108,779      
Subsidiary Term Loans | Term loans, SOFR plus 0.75%, weighted average of 5.06% as of June 30, 2025 , due June 2025 | China                        
Debt Instrument [Line Items]                        
Interest rate spread (as a percent)           0.75%            
Total debt     0     $ 0     35,000      
Subsidiary Term Loans | Term loans, SOFR plus 0.75%, weighted average of 5.06% as of June 30, 2025, due 2025 | China                        
Debt Instrument [Line Items]                        
Interest rate spread (as a percent)           0.75%            
Total debt     0     $ 0     55,500      
Subsidiary Term Loans | Term loans, SOFR plus 0.95%, weighted average of 5.25% as of June 30, 2025, due December 2026 | China                        
Debt Instrument [Line Items]                        
Interest rate spread (as a percent)           0.95%            
Total debt     $ 0     $ 0     $ 44,000      
Subsidiary Term Loans | Term Loan, fixed rate at 1.85%, Due April2024 | Korea                        
Debt Instrument [Line Items]                        
Interest rate (as a percent)     1.85%     1.85% 1.85%          
Face amount of debt | ₩                       ₩ 80,000,000,000.0
Borrowing capacity available                   $ 59,000 ₩ 80,000,000,000.0