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Segment Information (Long-Lived Asset Information) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 436,655 $ 442,944
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 145,813 148,748
Other Americas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 4,544 2,691
Total Americas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 150,357 151,439
Germany    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 237,190 243,120
Other Europe    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 37,057 35,573
Asia Pacific and Rest of World    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 12,051 $ 12,812