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Leases Textuals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Segment Reporting Information [Line Items]    
Amortization of Operating Lease Right-of-Use Asset $ 7,600  
Change in lease liability cash flow 8,100  
Operating Lease, Right-of-Use Asset 86,547 $ 92,700
Operating Lease, Liability 86,836 $ 93,500
Lessee Operating Lease Lease Not Yet Commenced Total Contract Value 5,200  
Operating Lease, Payments 8,400  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 1,900  
Us Operations segment Member    
Segment Reporting Information [Line Items]    
Quarterly Financial Information, Segment Reporting, Segment Assets, Material Change 35400000  
Swiss Operations segment Member    
Segment Reporting Information [Line Items]    
Quarterly Financial Information, Segment Reporting, Segment Assets, Material Change 1000000  
Western European Operations Segment [Member]    
Segment Reporting Information [Line Items]    
Quarterly Financial Information, Segment Reporting, Segment Assets, Material Change 21900000  
Chinese Operations Segment [Member]    
Segment Reporting Information [Line Items]    
Quarterly Financial Information, Segment Reporting, Segment Assets, Material Change 3500000  
Other Operations [Member]    
Segment Reporting Information [Line Items]    
Quarterly Financial Information, Segment Reporting, Segment Assets, Material Change 22800000  
Corporate Segment [Member]    
Segment Reporting Information [Line Items]    
Quarterly Financial Information, Segment Reporting, Segment Assets, Material Change 1900000