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Employee Retirement Plans (Expected Benefit Payments) (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Share-based Payment Arrangement [Abstract]  
2021 (expectation) to participant benefits $ 1,359
2021 3,476
2022 3,592
2023 3,669
2024 3,743
2025 3,718
2026-2029 $ 18,670