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Employee Retirement Plans (Expected Benefit Payments) (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Share-based Payment Arrangement [Abstract]  
2022 (expectation) to participant benefits $ 357
2022 3,816
2023 3,538
2024 3,524
2025 3,455
2026 3,431
2027-2031 $ 16,599