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3. Fair Value Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Equity Securities without Readily Determinable Fair Value, Amount $ 300 $ 600 $ 864,490
Investment ownership percentage 37.00%    
Carrying (Reported) Amount, Fair Value Disclosure [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Debt, Current $ 424,400 0  
Total long-term debt, excluding leases and current maturities 0 423,700  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Short-term Debt, Fair Value 435,500 0  
Total long-term debt, excluding leases and current maturities $ 0 $ 435,800