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Debt (Purchase Money Promissory Note) (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 18, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]        
Payment to repurchase common stocks   $ 1,150 $ 7,800  
Purchase Money Promissory Note [Member]        
Debt Instrument [Line Items]        
Maturity date Sep. 18, 2024 Sep. 18, 2024   Sep. 18, 2024
Interest rate 5.00%      
Payment to repurchase shares $ 3,500      
Class A [Member]        
Debt Instrument [Line Items]        
Shares repurchased plan, shares   75,157    
Class A [Member] | Purchase Money Promissory Note [Member]        
Debt Instrument [Line Items]        
Shares repurchased plan, shares 407,000      
Payment to repurchase common stocks $ 5,500