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Summary of Significant Accounting Policies - Derivative Instruments (Details) - Not Designated as Hedging Instrument [Member] - Interest Rate Swap [Member]
$ in Millions
Dec. 31, 2018
USD ($)
derivative
Dec. 31, 2017
USD ($)
derivative
Derivative [Line Items]    
Number of interest rate swaps | derivative 1 2
Notional amount $ 50.7 $ 78.9
Rent and Tenant Receivables and Other Assets, Net [Member]    
Derivative [Line Items]    
Derivative assets $ 0.5 $ 0.6