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Employee Retirement Plans (Expected Benefit Payments) (Details) - Pension plan
$ in Thousands
Mar. 31, 2017
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2018 (expectation) to participant benefits $ 463
2018 3,152
2019 3,254
2020 3,329
2021 3,416
2022 3,578
2023-2027 $ 18,888