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Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for credit losses        
Balance at Beginning of Period   $ 5,000    
Charged to Expense $ (5,000) $ (5,000)
Balance at End of Period     5,000  
Cumulative Effect of Adoption Adjustment | ASU 2016-13        
Allowance for credit losses        
Balance at Beginning of Period     $ 5,000  
Balance at End of Period       $ 5,000