Pension Plan and Employee Benefits - 401 (K) Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Contribution Plan Disclosure [Line Items]
401(k) Plan expense	$ 1,926	$ 1,522	$ 4,080	$ 3,702
Affiliated entity
Defined Contribution Plan Disclosure [Line Items]
401(k) Plan expense	$ 670	$ 539	$ 1,572	$ 1,449