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Summary of Significant Accounting Policies (Concentration of Credit Risk Narrative) (Details) - Customer Concentration Risk
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Sales Revenue | First Largest Customer      
Concentration Risk [Line Items]      
Concentration risk percentage 14.00% 18.00% 17.00%
Sales Revenue | Second Largest Customer      
Concentration Risk [Line Items]      
Concentration risk percentage 12.00% 12.00% 12.00%
Accounts Receivable | First Largest Customer      
Concentration Risk [Line Items]      
Concentration risk percentage 0.00% 5.00%  
Accounts Receivable | Second Largest Customer      
Concentration Risk [Line Items]      
Concentration risk percentage 2.00% 4.00%