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Derivatives and Hedging Activities (Summary of Derivative Instruments) (Details)
Mar. 31, 2020
USD ($)
instrument
Dec. 31, 2019
USD ($)
instrument
Nov. 01, 2019
USD ($)
Derivative [Line Items]      
Notional Amount     $ 88,700,000
Derivatives designated as hedging instruments: | Interest rate “pay-fixed” swaps      
Derivative [Line Items]      
Number of Instruments | instrument 9 9  
Notional Amount $ 578,500,000 $ 578,500,000  
Derivatives not designated as hedging instruments: | Interest rate caps      
Derivative [Line Items]      
Number of Instruments | instrument 7 6  
Notional Amount $ 359,322,000 $ 359,322,000