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These investments were not measured due to an observable price change or impairment during the six months ended June 30, 2022. (Details) - Fair Value, Recurring [Member] - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in other equity securities that do not report net asset value $ 37,691,000 $ 21,241,000
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in other equity securities that do not report net asset value
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in other equity securities that do not report net asset value
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in other equity securities that do not report net asset value $ 37,691,000 $ 21,241,000