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Fair Value Measurements (Summary Of Financial Assets And Liabilities Accounted For At Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Assets:    
Investments in marketable securities $ 176,056 $ 162,797
Liabilities:    
Derivatives 629 $ 13,288
Interest Rate Swap    
Assets:    
Investments in marketable securities 176,056  
Derivatives 9,983  
Total assets 186,039  
Liabilities:    
Derivatives 4,071  
Interest Rate Swap | Level 1    
Assets:    
Investments in marketable securities 64,965  
Derivatives 8,366  
Total assets 73,331  
Liabilities:    
Derivatives 0  
Interest Rate Swap | Level 2    
Assets:    
Investments in marketable securities 111,091  
Derivatives 1,234  
Total assets 112,325  
Liabilities:    
Derivatives 4,130  
Interest Rate Swap | Level 3    
Assets:    
Investments in marketable securities 0  
Derivatives 383  
Total assets 383  
Liabilities:    
Derivatives $ (59)