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Leases (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]      
Option terms of lease 5 years    
Minimum cash lease payments $ 90,484    
Minimum sublease rentals 11,790    
Sublease income $ 2,530 $ 2,214 $ 2,074
Number of sale leaseback transactions | item 6    
Total deemed landlord financing $ 2,390 $ 2,630  
Shopping Center Or Building Leases [Member] | Minimum [Member]      
Operating Leased Assets [Line Items]      
Combined initial and option terms lease 20 years    
Shopping Center Or Building Leases [Member] | Maximum [Member]      
Operating Leased Assets [Line Items]      
Combined initial and option terms lease 25 years    
Ground Leases [Member] | Minimum [Member]      
Operating Leased Assets [Line Items]      
Combined initial and option terms lease 30 years    
Ground Leases [Member] | Maximum [Member]      
Operating Leased Assets [Line Items]      
Combined initial and option terms lease 40 years