Benefit Plans - Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Pension plan settlement expense	$ 112,796	$ 0	$ 0
Pension Plans | Primary Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	5,982	8,978	8,479
Expected return on plan assets	(4,608)	(6,320)	(11,799)
Recognized net actuarial loss	1,946	3,588	4,090
Net periodic pension/postretirement benefit cost	3,320	6,246	770
Pension plan settlement expense	112,796	0	0
Total pension expense	116,116	6,246	770
Pension Plans | Bargaining Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3,996	6,586	7,529
Interest cost	2,079	1,664	1,367
Expected return on plan assets	(2,438)	(1,823)	(1,201)
Recognized net actuarial loss	0	402	864
Amortization of prior service costs	16	0	3
Net periodic pension/postretirement benefit cost	$ 3,653	$ 6,829	$ 8,562