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Investments In Securities and Fair Value (Schedule of Cost-method Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value Assets Measured on Nonrecurring Basis [Line Items]    
Equity investments in unconsolidated affiliates, measurement alternative $ 9,316 $ 9,300
Notes receivable, fair value disclosure 641 2,201
Assets, fair value disclosure 9,957 11,501
Level 1    
Fair Value Assets Measured on Nonrecurring Basis [Line Items]    
Equity investments in unconsolidated affiliates, measurement alternative 0 0
Notes receivable, fair value disclosure 0 0
Assets, fair value disclosure 0 0
Level 2    
Fair Value Assets Measured on Nonrecurring Basis [Line Items]    
Equity investments in unconsolidated affiliates, measurement alternative 0 0
Notes receivable, fair value disclosure 0 0
Assets, fair value disclosure 0 0
Level 3    
Fair Value Assets Measured on Nonrecurring Basis [Line Items]    
Equity investments in unconsolidated affiliates, measurement alternative 9,316 9,300
Notes receivable, fair value disclosure 641 2,201
Assets, fair value disclosure $ 9,957 $ 11,501