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Segment Reporting (Schedule Of Net Long-Lived Assets By Principal Geographic Areas) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets $ 333,026 $ 303,587
Americas [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 295,591 267,951
Americas [Member] | United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 285,391 262,475
Americas [Member] | Brazil [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 8,404 3,206
Americas [Member] | Canada [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 1,796 2,270
Europe, The Middle East And Africa [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 30,410 30,135
Europe, The Middle East And Africa [Member] | United Kingdom [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 13,269 14,366
Europe, The Middle East And Africa [Member] | Germany [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 5,159 4,836
Europe, The Middle East And Africa [Member] | Netherlands [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 4,425 3,456
Europe, The Middle East And Africa [Member] | France [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 2,679 3,172
Europe, The Middle East And Africa [Member] | Switzerland [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 2,831 2,631
Europe, The Middle East And Africa [Member] | Other Europe [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 2,047 1,674
Asia Pacific Region [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 7,025 5,501
Asia Pacific Region [Member] | Japan [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 2,210 2,204
Asia Pacific Region [Member] | Australia [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets 2,135 1,789
Asia Pacific Region [Member] | Other Asia Pacific [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net Assets $ 2,680 $ 1,508