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Summary of Significant Accounting Policies (Other Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Allowance for doubtful accounts and cash discounts $ 334 $ 319  
Tax on payments of dividend equivalent rights 3,684 8,967 $ 8,696
Segment Reporting Information [Line Items]      
Shipping and handling fees and costs 1,367,145 1,301,579 1,292,484
Tobacco and E-Cigarettes      
Segment Reporting Information [Line Items]      
Advertising costs 4,103 3,751 3,672
Real Estate      
Segment Reporting Information [Line Items]      
Shipping and handling fees and costs 571,241 530,449 505,233
Advertising costs 18,875 22,917 23,424
Shipping and Handling      
Segment Reporting Information [Line Items]      
Shipping and handling fees and costs $ 5,602 $ 5,802 $ 5,658