Description of the Business and Significant Accounting Policies - Short-term Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Description of the Business and Significant Accounting Policies
Interest Income from invested cash and short-term investments	$ 25,100	$ 28,800	$ 72,000	$ 80,300
Short-term investments	$ 645,343		$ 645,343		$ 721,210