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Derivatives and Hedging Activities - Narrative (Details) € in Millions, £ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) derivative	Sep. 30, 2018 USD ($) derivative	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 GBP (£)
Derivative Instruments, Gain (Loss) [Line Items]
Gain for accelerated reclassification of amounts in other comprehensive income to earnings	$ (2,151)			$ (339)
Loss for accelerated reclassification of amounts in other comprehensive income to earnings					$ 24,449	$ 22,691
Loss to be reclassified from other comprehensive income					1,600,000
Accumulated other comprehensive (loss) income	(3,982,000)				(3,982,000)			$ 6,810,000
Gains (losses) on derivative instruments	1,390,000			6,333,000	1,630,000	3,398,000
Fair value of derivatives in net liability position	8,000,000.0				8,000,000.0
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	1,400,000			$ 6,300,000	1,700,000	$ 3,400,000
Interest rate swaps, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain recognized in accumulated other comprehensive income (loss) from derivatives (effective portion)	(4,397,000)				(9,094,000)
Multi-Property Loan, Finland
Derivative Instruments, Gain (Loss) [Line Items]
Number interest rates swaps terminated | derivative		5
Notional amount | €							€ 57.4
Payment to settle derivatives		$ 800,000
Amount of (loss) gain recognized in accumulated other comprehensive income (loss) from derivatives (effective portion)					700,000
Amount of loss reclassified from accumulated other comprehensive income (loss) into income as interest expense (effective portion)					100,000
Accumulated other comprehensive (loss) income	500,000				500,000
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)					100,000
Accumulated other comprehensive (loss) income	$ 400,000		$ 1,200,000		$ 400,000
Multi-Property GBP Loan | Interest rate swaps, net
Derivative Instruments, Gain (Loss) [Line Items]
Number interest rates swaps terminated | derivative			15
Notional amount | £									£ 208.8
Multi-Property GBP Loan | Interest Rate Floor
Derivative Instruments, Gain (Loss) [Line Items]
Number interest rates swaps terminated | derivative			1
Notional amount | £									£ 28.1

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