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Property and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property and equipment $ 34,714 $ 22,183  
Depreciation and amortization 12,051 10,574 $ 8,642
Internally Developed Software [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment 1,700 1,600  
Depreciation and amortization $ 5,000 $ 4,000 $ 2,500