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Leases (Components of Lease Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease cost:    
Interest expense on lease liabilities $ 1,289 $ 1,023
Total lease cost 36,788 43,584
Cost of sales and merchandising revenues    
Lease cost:    
Operating lease cost 21,127 26,230
Amortization of right-of-use assets 1,451 357
Other lease cost 663 822
General and Administrative Expense [Member]    
Lease cost:    
Operating lease cost 10,990 13,711
Amortization of right-of-use assets 1,008 1,119
Operating, administrative and general expenses    
Lease cost:    
Other lease cost $ 260 $ 322