Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narratives (Details)

v3.20.4
Summary of Significant Accounting Policies - Narratives (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies Table      
Foreign currency exchange (gain) loss $ (4,172) $ 2,410 $ 12,543
Restricted cash included in prepaid and other current assets 1,688 1,331  
Allowance for credit loss 1,521 2,068  
Interest costs capitalized 1,780 1,981 3,576
Research and development cost $ 11,597 12,514 $ 13,719
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)   $ 2,102  
Maximum      
Summary of Significant Accounting Policies Table      
Remaining lease term 30 years    
Building and building improvements | Minimum      
Summary of Significant Accounting Policies Table      
Fixed asset useful life 15 years    
Building and building improvements | Maximum      
Summary of Significant Accounting Policies Table      
Fixed asset useful life 33 years    
Machinery and equipment | Minimum      
Summary of Significant Accounting Policies Table      
Fixed asset useful life 3 years    
Machinery and equipment | Maximum      
Summary of Significant Accounting Policies Table      
Fixed asset useful life 10 years