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Employee Benefit Plans (Amounts Recognized on Balance Sheet) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Current liabilities $ (1,266) $ (1,285)
Non-current liabilities (41,998) (53,909)
Net liabilities $ (43,264) $ (55,194)