Significant Accounting Policies - Derivative Accounting (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Notional derivative contracts	$ 1,906,092	$ 2,842,846
CME
Derivative Instruments, Gain (Loss) [Line Items]
Notional derivative contracts	$ 1,800,000
Percent of total notional derivative contracts	92.60%
Amount of variation margin included as settlement	$ (40,000)
LCH
Derivative Instruments, Gain (Loss) [Line Items]
Notional derivative contracts	$ 100,000
Percent of total notional derivative contracts	7.40%
Amount of variation margin included as settlement	$ (4,000)