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Revenue from Contracts with Customers (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Brokerage revenue      
Disaggregation of Revenue [Line Items]      
Revenue from Contract with Customer $ 15,599 $ 15,877 $ 16,480