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Derivative Instruments and Hedging Activities (Details Textual) - Interest rate swap [Member] - Contract
Mar. 31, 2018
Apr. 01, 2010
Derivative Instruments and Hedging Activities (Textual) [Abstract]    
Number of Interest rate swap agreements   2
First half of mortgage [Member]    
Derivative Instruments and Hedging Activities (Textual) [Abstract]    
Strike rate 5.91%  
Second half of mortgage [Member]    
Derivative Instruments and Hedging Activities (Textual) [Abstract]    
Strike rate 6.07%