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Employee Benefit Plans (Amount to be Amortized from Accumulated Other Comprehensive Income (Loss)) (Details) $ in Thousands | Mar. 31, 2018 USD ($)
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Amortization of net prior service credits | $ (381)
Amortization of net actuarial loss | 95
Total | $ (286)

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