Derivatives and Hedging Activities - Narrative (Details) $ in Thousands, € in Millions, £ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) derivative	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) derivative	Sep. 30, 2018 USD ($) derivative	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 EUR (€)	Sep. 30, 2018 GBP (£)
Derivative Instruments, Gain (Loss) [Line Items]
Losses for accelerated reclassification of amounts in other comprehensive income to earnings			$ 100				$ 100
Loss to be reclassified from other comprehensive income						$ 7,100
Accumulated other comprehensive (loss) income	$ (5,630)					(5,630)			$ 20,195
Gains (losses) on derivative instruments	(2,464)		3,044			362	4,674
Fair value of derivatives in net liability position	19,300					19,300
Multi-Property Loan, France | Interest rate swaps, net
Derivative Instruments, Gain (Loss) [Line Items]
Derivative asset, notional amount | €								€ 14.5
Payment to settle derivatives		$ 100
Multi-Property Loan, Finland
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in accumulated other comprehensive income (loss) from derivatives (effective portion)				$ (700)
Amount of loss reclassified from accumulated other comprehensive income (loss) into income as interest expense (effective portion)	(100)					(300)
Multi-Property Loan, Finland | Interest rate swaps, net
Derivative Instruments, Gain (Loss) [Line Items]
Number interest rates swaps terminated | derivative		2		5
Derivative asset, notional amount | €										€ 57.4
Payment to settle derivatives				$ 800
Multi-Property GBP Loan
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified from accumulated other comprehensive income (loss) into income as interest expense (effective portion)	(18)					(200)
Accumulated other comprehensive (loss) income	0				$ (1,200)	0
Multi-Property GBP Loan | Interest rate swaps, net
Derivative Instruments, Gain (Loss) [Line Items]
Number interest rates swaps terminated | derivative					15
Derivative asset, notional amount | £											£ 208.8
Multi-Property GBP Loan | Interest Rate Floor
Derivative Instruments, Gain (Loss) [Line Items]
Number interest rates swaps terminated | derivative					1
Derivative asset, notional amount | £											£ 28.1
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (2,500)		$ 3,100			$ 400	$ 4,800