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Employee Benefit Plans (Amounts Recognized on Balance Sheet) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Current liabilities $ (1,763) $ (1,266)
Non-current liabilities (42,434) (41,998)
Net liabilities $ (44,197) $ (43,264)