Debt - Advance Funding Arrangement (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt
Principal	$ 558,728,000	$ 451,120,000
Unaccreted discount	115,366,000	847,000
Interest expense	$ 31,828,000	8,723,000	$ 5,757,000
Advance funding arrangement
Debt
Interest rate (stated)	14.00%
Principal	$ 94,000	15,670,000
Unaccreted discount	0	760,000
Interest expense	$ 900,000	$ 2,600,000