Pension Plan and Employee Benefits - 401 (K) Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Contribution Plan Disclosure [Line Items]
401(k) Plan expense	$ 1,831	$ 2,120	$ 4,422	$ 4,880
Other Subsidiaries
Defined Contribution Plan Disclosure [Line Items]
401(k) Plan expense	$ 847	$ 946	$ 2,169	$ 2,326