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Derivative Instruments (Narrative) (Details) - Interest Rate Swap - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Jan. 31, 2020
Derivative [Line Items]    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 1,900  
Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative, notional amount   $ 400,000