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Preferred Stock (Details)
$ in Thousands
 12 Months Ended
Sep. 23, 2016
USD ($)
Aug. 26, 2016
€ / shares
shares
Aug. 19, 2016
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Class of Stock [Line Items]            
Common shares issued on conversion of Series A preferred stock (in shares)   52,976,000 52,976,000      
Par value per share (EUR per share) | € / shares   € 0.01        
Preferred stock dividend rate (percent)   0.25%        
Increase in number of common shares of authorized capital (in shares)   52,976,000        
Cash payment | $       $ 0 $ 595 $ 0
Series A Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, number of shares exchanged     52,976,000      
Preferred stock, outstanding (in shares)   0        
Number of votes per preferred share   1        
Preferred stock, issued (in shares)   0        
Cash payment | $ $ 600          
Limited Partnership Units            
Class of Stock [Line Items]            
Units of partnership interest, number of shares exchanged     52,976,000