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Pension Benefits - Contributions and Expected Benefit Payments (Details) - Pension Plan
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
Pension Benefits  
Future employer contributions in next fiscal year $ 13,000
2024 92,128
2025 93,019
2026 94,082
2027 94,904
2028 95,468
2029-2033 471,405
Qualified Plans  
Pension Benefits  
Pension contributions 10,500
2024 75,066
2025 76,551
2026 77,850
2027 78,841
2028 79,553
2029-2033 399,518
Non- Qualified Plans  
Pension Benefits  
2024 17,062
2025 16,468
2026 16,232
2027 16,063
2028 15,915
2029-2033 $ 71,887