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Cash Equivalents And Restricted Cash And Securities (Summary Of Cash Equivalents And Restricted Cash And Securities) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Line Items]        
Cost Basis $ 54,131 $ 37,588 $ 38,497 $ 33,375
Cost Basis   5,000    
Cost Basis 744 830    
Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cost Basis   5,000    
Unrealized Holding Gains      
Estimated Market Value   5,000    
Money Market Funds [Member]        
Cash and Cash Equivalents [Line Items]        
Cost Basis 2,260 549    
Cost Basis 744 830    
Unrealized Holding Gains    
Estimated Market Value 2,260 549    
Estimated Market Value $ 744 $ 830