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Employee Retirement Plans (Expected Benefit Payments) (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
2019 (expectation) to participant benefits $ 1,461
2019 3,314
2020 3,386
2021 3,463
2022 3,588
2023 3,674
2024-2028 $ 19,157