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Derivatives (Effect of Interest Rate Contracts on the Statement of Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
The effect of interest rate contracts on the statement of operations:    
Loss recognized in income on interest rate contracts $ 3 $ 516
(Gain) loss recognized in AOCI on interest rate contracts (effective portion) 1,253 (560)
Loss reclassified from AOCI into income (effective portion) $ 3 $ 516