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Leases (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Leases [Abstract]      
Rental expense   $ 297,568  
Operating lease payments related to options to extend lease terms $ 2,117,481    
Operating minimum lease payments 184,358    
Future sublease income $ 14,735    
Number of sale leaseback transactions | item 6    
Total deemed landlord financing $ 1,845   $ 2,131