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Breakdown of Revenue and Non-Current Assets by Geographical Areas - Other Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets $ 235,391 $ 211,525
Americas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 135,241 123,308
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 134,701 122,474
Europe    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 7,991 7,132
Asia-Pacific    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 21,354 26,033
Japan    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets 7,772 8,965
Holding    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Non-current assets $ 70,805 $ 55,052