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Fair Value Measurements (Narrative) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
item
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term investments $ 37,068   $ 40,696
Short-term investments 1,864   $ 1,331
Purchase of short-term investments 213,300 $ 30,200  
Proceeds from sale of short-term investments $ 213,000 $ 30,200  
Minimum [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Average discount rate | item 7.2    
Maximum [Member] | Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Average discount rate | item 8.7    
Revolving Credit Facility [Member] | Minimum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Basis spread on variable interest rate 1.125%    
Revolving Credit Facility [Member] | Maximum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Basis spread on variable interest rate 1.50%