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Derivatives and Hedging Activities (Summary of Derivative Instruments) (Details)
Dec. 31, 2019
USD ($)
instrument
Nov. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
instrument
Derivative [Line Items]      
Notional Amount   $ 88,700,000  
Designated as Hedging Instrument | Interest rate swaps      
Derivative [Line Items]      
Number of Instruments | instrument 9   2
Notional Amount $ 578,500,000   $ 250,000,000
Not Designated as Hedging Instrument | Interest rate caps      
Derivative [Line Items]      
Number of Instruments | instrument 6   7
Notional Amount $ 359,322,000   $ 359,322,000