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Debt And Credit Agreements (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2013
Apr. 23, 2012
Unsecured Revolving Credit Facility
Apr. 23, 2012
Previous Unsecured Revolving Credit Facility
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 350,000,000 $ 300,000,000
Line of credit facility, term   5 years 4 years
Line of credit facility, option to increase additional amount   75,000,000  
Amount borrowed under the Credit Agreement   102,000,000  
Credit spread over LIBOR, basis points 1.80%    
Line of credit facility, covenant terms, maximum debt to EBITDA ratio 3.0    
Line of credit facility, covenant terms, minimum adjusted EBIT-to-interest expense ratio 2.5    
Line of credit facility, covenant terms, maximum aggregate distributions 100,000,000    
Line of credit facility, covenant terms, percentage of distributions to net income 50.00%    
Line of credit facility, covenant terms, minimum shareholders' equity 320,000,000    
Line of credit facility, covenant terms, percentage of shareholders' equity to net income 50.00%    
Available credit under the Credit Agreement $ 165,000,000