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Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets:    
Investments in marketable securities $ 154,629 $ 90,209
Derivatives 2,268  
Total assets 156,897  
Liabilities:    
Derivatives 2,296 $ 101
Level 1    
Assets:    
Investments in marketable securities 60,896  
Derivatives 0  
Total assets 60,896  
Liabilities:    
Derivatives 2,305  
Level 2    
Assets:    
Investments in marketable securities 93,733  
Derivatives 237  
Total assets 93,970  
Liabilities:    
Derivatives 34  
Level 3    
Assets:    
Investments in marketable securities 0  
Derivatives 2,031  
Total assets 2,031  
Liabilities:    
Derivatives $ (43)