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Pension Benefits - Contributions and Expected Benefit Payments (Details) - Pension Plan
$ in Thousands
12 Months Ended
Dec. 31, 2022
USD ($)
Pension Benefits  
Future employer contributions in next fiscal year $ 11,000
2023 90,518
2024 92,282
2025 94,008
2026 95,249
2027 96,486
2028-2032 487,554
Qualified Plans  
Pension Benefits  
Pension contributions 11,200
2023 73,742
2024 75,741
2025 77,742
2026 79,180
2027 80,587
2028-2032 413,683
Non- Qualified Plans  
Pension Benefits  
2023 16,776
2024 16,541
2025 16,266
2026 16,069
2027 15,899
2028-2032 $ 73,871