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Fair Value Measurements (Narrative) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
property
Sep. 30, 2015
USD ($)
property
Dec. 31, 2015
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Percentage of deferred compensation invested in life insurance contracts 65.00%    
Number of years long-term sales growth forecasted over 6 years    
Average long-term sales growth forecast, over next 4 years, percent per year 15.00%    
Combined carrying value | $ $ 153,167 $ 150,424 $ 150,600
Vacant Owned Facilities      
Fair Value, Balance Sheet Grouping, Financial Statement Captions      
Number Of Vacant Facilities Reopened   1  
Number of vacant owned facilities 1 3  
Number Of Vacant Owned Facilities Sold   1  
Number of properties classified as fixed assets 1 1  
Estimated combined fair value | $ $ 3,000 $ 3,000  
Combined carrying value | $ $ 2,500 $ 2,500