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Risk Management and Use of Derivative Financial Instruments - Interest Rate Swap and Caps Summary (Details)
€ in Thousands, £ in Thousands, $ in Thousands
Sep. 30, 2020
USD ($)
numberOfDerivativeInstrument
Sep. 30, 2020
EUR (€)
numberOfDerivativeInstrument
Sep. 30, 2020
GBP (£)
numberOfDerivativeInstrument
Derivative Disclosure      
Fair value $ (6,417)    
Derivatives Designated as Hedging Instruments | Designated as Cash Flow Hedging Instruments | Interest rate swaps | USD      
Derivative Disclosure      
 Number of Instruments | numberOfDerivativeInstrument 5 5 5
Notional Amount $ 74,453    
Fair value $ (4,744)    
Derivatives Designated as Hedging Instruments | Designated as Cash Flow Hedging Instruments | Interest rate swaps | EUR      
Derivative Disclosure      
 Number of Instruments | numberOfDerivativeInstrument 2 2 2
Notional Amount | €   € 48,734  
Fair value $ (1,612)    
Derivatives Designated as Hedging Instruments | Designated as Cash Flow Hedging Instruments | Interest rate caps | EUR      
Derivative Disclosure      
 Number of Instruments | numberOfDerivativeInstrument 1 1 1
Notional Amount | €   € 11,154  
Fair value $ 1    
Derivatives Designated as Hedging Instruments | Designated as Cash Flow Hedging Instruments | Interest rate caps | GBP      
Derivative Disclosure      
 Number of Instruments | numberOfDerivativeInstrument 1 1 1
Notional Amount | £     £ 6,394
Fair value $ 0    
Not Designated as Hedging Instruments | Interest rate swaps | EUR      
Derivative Disclosure      
 Number of Instruments | numberOfDerivativeInstrument 1 1 1
Notional Amount | €   € 4,520  
Fair value $ (62)