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Fair Value Measurement (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Feature Film Production Assets [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset impairment charges $ 421,000 $ 444,000
Fair value of assets 512,000 515,000
Long-Lived Property And Equipment [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset impairment charges 0 $ 0
Equity Method Investments [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset impairment charges 8,828,000  
Equity Securities [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset impairment charges $ 2,715,000