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, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of Significant Accounting Policies Table      
Foreign currency exchange loss (gain) $ 13,810 $ 25,786 $ (3,558)
Restricted cash included in prepaid and other current assets 1,872 1,048 14,335
Interest costs capitalized 3,542 5,806 5,687
Research and development cost $ 15,565 $ 13,859 $ 7,266
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