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Summary of Significant Accounting Policies - Goodwill and Intangible Impairment (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
numberOfReportingUnits
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Goodwill [Line Items]      
Goodwill $ 193,784 $ 188,596 $ 188,665
AUSTRALIA      
Goodwill [Line Items]      
Number of reporting units | numberOfReportingUnits 5    
Goodwill Impairment $ 3,500    
Impairment of intangible assets 900    
ITALY      
Goodwill [Line Items]      
Goodwill 3,500    
QUEBEC      
Goodwill [Line Items]      
Goodwill $ 2,500