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Accounts Receivable and Credit Losses (Credit Quality Analysis of Financing Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]      
Total $ 47,995 $ 50,025 $ 50,215
Institutional Loans, Past Due   24,276 18,800
Institutional Loans, Current   25,749 31,415
Total Institutional Loans 47,995 50,025 50,215
Financing Receivables 1 To 30 Days Past Due [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 767    
2017 444    
2018 589    
2019 909    
2020 342    
2021 23    
Total 3,074    
Institutional Loans, Past Due   7,192 3,226
Total Institutional Loans 3,074    
Financing Receivables 31 To 60Days Past Due [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 631    
2017 500    
2018 97    
2019 123    
2020 183    
2021 29    
Total 1,563    
Institutional Loans, Past Due   1,755 1,601
Total Institutional Loans 1,563    
Financing Receivables 61 To 90 Days Past Due [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 261    
2017 417    
2018 69    
2019 195    
2020 245    
2021 0    
Total 1,187    
Institutional Loans, Past Due   1,547 566
Total Institutional Loans 1,187    
Financing Receivables Greater Than 90 Days Past Due [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 7,635    
2017 2,367    
2018 2,200    
2019 1,027    
2020 506    
2021 0    
Total 13,735    
Institutional Loans, Past Due   $ 13,782 $ 13,407
Total Institutional Loans 13,735    
Financing Receivable Past Due [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 9,294    
2017 3,728    
2018 2,955    
2019 2,254    
2020 1,276    
2021 52    
Total 19,559    
Total Institutional Loans 19,559    
Financing Receivable Current [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 11,824    
2017 5,389    
2018 3,891    
2019 4,205    
2020 2,271    
2021 856    
Total 28,436    
Total Institutional Loans 28,436    
Financing Receivable Gross [Member]      
Financing Receivable, Credit Quality Indicator [Line Items]      
Prior 21,118    
2017 9,117    
2018 6,846    
2019 6,459    
2020 3,547    
2021 908    
Total 47,995    
Total Institutional Loans $ 47,995