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Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies        
Cash and cash equivalents $ 149,866 $ 465,708 $ 403,881 $ 132,360
Short-term investments $ 200,229 $ 0