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Derivatives (Effect of interest rate contracts on statement of operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Effect of Interest rate Contracts [Abstract]      
Loss recognized in income on interest rate contracts $ 3,893 $ 8,603 $ 12,699
(Gain) recognized in AOCI on interest rate contracts (effective portion) (4,445) (9,916) (9,721)
Loss reclassified from AOCI into income (effective portion) 3,893 8,628 12,616
(Gain) loss recognized in income on interest rate contracts (ineffective portion and amount excluded from effectiveness testing) $ (25) $ 83