Quarterly report pursuant to Section 13 or 15(d)

Short Term Borrowings and Credit Lines (Details)

v3.20.2
Short Term Borrowings and Credit Lines (Details)
6 Months Ended
Apr. 15, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
CAD ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
JPY (¥)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Variable Commitments Revolving Credit Facility | Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity             $ 50,000,000.0  
Revolving Credit Facility, First Amendment | Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity           $ 125,000,000.0    
Revolving A Loan | Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 125,000,000.0              
LIBOR floor interest rate 0.75%              
Revolving B Loan | Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 400,000,000.0              
Line of credit facility, increase limit $ 100,000,000.0              
LIBOR floor interest rate 1.00%              
Revolving Loans | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum | Revolving Credit Facility                
Debt Instrument [Line Items]                
Basis spread on variable rate 2.00%              
Revolving Loans | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum | Revolving Credit Facility                
Debt Instrument [Line Items]                
Basis spread on variable rate 2.75%              
Revolving Loans | Line of Credit | Base Rate | Minimum | Revolving Credit Facility                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.00%              
Revolving Loans | Line of Credit | Base Rate | Maximum | Revolving Credit Facility                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.75%              
Revolving Loans | Line of Credit | Fed Funds Effective Rate Overnight Index Swap Rate | Revolving Credit Facility                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.50%              
Canadian Subsidiary | Unsecured And Uncommitted Line Of Credit | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 22,000,000.0 $ 30,000,000.0          
Amount outstanding   $ 0            
Canadian Subsidiary | Unsecured And Uncommitted Line Of Credit | Line of Credit | Bankers' Acceptance Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.50%            
European Subsidiary | Unsecured And Uncommitted Line Of Credit | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity | €       € 600,000        
Stated interest rate   0.75% 0.75% 0.75% 0.75%      
European Subsidiary | Unsecured And Uncommitted Credit Line1 | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity | €       € 25,800,000       € 25,800,000
Stated interest rate   1.85% 1.85% 1.85% 1.85%      
European Subsidiary | Unsecured And Uncommitted Credit Line1 | Line of Credit | Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   2.75%            
European Subsidiary | Unsecured And Uncommitted Credit Line2 | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity | €               € 5,000,000.0
European Subsidiary | Secured And Committed Credit Line | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity | €       € 4,400,000        
Stated interest rate   0.75% 0.75% 0.75% 0.75%      
European Subsidiary | Unsecured And Uncommitted, Secured And Committed, Credit Lines | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity | €       € 34,600,000        
Amount outstanding | €       € 0        
Japanese Subsidiary | Unsecured And Uncommitted Overdraft Facililty1 | Overdraft Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 7,000,000.0            
Amount outstanding   0            
Japanese Subsidiary | Unsecured And Uncommitted Overdraft Facility2 | Overdraft Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity | ¥         ¥ 300,000,000.0      
Amount outstanding   300,000,000.0            
Japanese Subsidiary | Unsecured And Uncommitted Overdraft Facility | Overdraft Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   9,800,000            
Amount outstanding   $ 2,800,000            
Stated interest rate   2.75% 2.75% 2.75% 2.75%      
Effective interest rate   0.54% 0.54% 0.54% 0.54%      
Japanese Subsidiary | Unsecured And Uncommitted Overdraft Facility | Overdraft Facility | Tokyo Interbank Offered Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.05%            
Korean Subsidiary | Unsecured And Uncommitted Line Of Credit | Overdraft Facility | Korea Three Month CD Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   2.75%            
Korean Subsidiary | Unsecured And Uncommitted Overdraft Facility | Overdraft Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 20,000,000.0            
Amount outstanding   $ 0            
China Subsidiary | Unsecured And Uncommitted Overdraft And Clean Advance Facility | Overdraft Facility | People's Bank Of China Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   10.00%            
China Subsidiary | Unsecured And Uncommitted Overdraft And Clean Advance Facility | Overdraft And Clean Advance Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 20,000,000.0            
Amount outstanding   $ 0            
China Subsidiary | Unsecured And Uncommitted Overdraft And Clean Advance Facility | Overdraft And Clean Advance Facility | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread on variable rate   1.80%            
China Subsidiary | Unsecured And Uncommitted Overdraft And Clean Advance Facility | Overdraft And Clean Advance Facility | People's Bank Of China Base Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate   0.85%