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Investments In Securities and Fair Value (Schedule of Cost-method Investments) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Line Items]    
Beginning balance $ 13,675 $ 8,741
Other than temporary impairment losses, investments 0 0
Observable changes 0 0
Purchases and additional commitments paid 722 6,543
Sales, returns of capital, and other reductions (137) (1,609)
Ending balance 14,260 13,675
Real Estate Investment    
Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Line Items]    
Beginning balance 4,987 0
Other than temporary impairment losses, investments 0 0
Observable changes 0 0
Purchases and additional commitments paid 0 5,000
Sales, returns of capital, and other reductions 0 (13)
Ending balance 4,987 4,987
Cost-method Investments    
Fair​Value​Assets​Measured​On​Nonrecurring​Basis​Reconciliation​Calculation​Roll​Forward [Line Items]    
Beginning balance 8,688 8,741
Other than temporary impairment losses, investments 0 0
Observable changes 0 0
Purchases and additional commitments paid 722 1,543
Sales, returns of capital, and other reductions (137) (1,596)
Ending balance $ 9,273 $ 8,688