Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narratives (Details)

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Summary of Significant Accounting Policies - Narratives (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of Significant Accounting Policies Table      
Foreign currency exchange loss $ 2,787 $ 13,810 $ 25,786
Restricted cash included in prepaid and other current assets 1,633 1,872  
Interest costs capitalized 1,941 3,542 5,806
Research and development cost $ 14,030 15,565 $ 13,859
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