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Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Assets:    
Investments in marketable securities $ 205,646 $ 201,910
Derivatives 8,680 $ 9,052
Total assets 214,326  
Liabilities:    
Derivatives 476  
Level 1 [Member]    
Assets:    
Investments in marketable securities 49,742  
Derivatives 2,893  
Total assets 52,635  
Liabilities:    
Derivatives 437  
Level 2 [Member]    
Assets:    
Investments in marketable securities 155,904  
Derivatives 977  
Total assets 156,881  
Liabilities:    
Derivatives 0  
Level 3 [Member]    
Assets:    
Investments in marketable securities 0  
Derivatives 4,810  
Total assets 4,810  
Liabilities:    
Derivatives $ 39