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Summary of Significant Accounting Policies Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accounting Policies [Abstract]          
Treasury money market funds, at fair value $ 149,700   $ 149,700   $ 168,100
Equity Investments 7,200   7,200   7,100
Gain (Loss) on Investments 0 $ 3,308 0 $ 3,308  
Deferred Costs 14,100   14,100   14,800
Amortization of Deferred Charges 1,400 1,500 4,400 4,300  
Capitalized Contract Cost, Net 1,100   1,100   $ 1,600
Capitalized Contract Cost, Amortization 200 300 600 900  
Asset Impairment Charges $ 0 $ 0 $ 0 $ 1,551