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Risks and Contingencies (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Customer
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2022
USD ($)
Loss Contingencies [Line Items]        
Reserve for probable and estimated liabilities $ 756      
Commercial Dispute [Member]        
Loss Contingencies [Line Items]        
Number of customers involved in litigation | Customer 1      
Amount awarded in litigation     $ 7,500  
Cash paid in litigation settlement $ 2,000 $ 1,000    
Litigation settlement payable       $ 1,000