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Derivatives and Hedging Activities - Narrative (Details) € in Millions, £ in Millions		3 Months Ended		12 Months Ended
	Aug. 13, 2018 USD ($) derivative	Mar. 31, 2019 USD ($) derivative	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2019 EUR (€)	Mar. 31, 2019 USD ($)	Aug. 13, 2018 GBP (£)
Derivative Instruments, Gain (Loss) [Line Items]
Loss for accelerated reclassification of amounts in other comprehensive income to earnings		$ 26,600	$ 23,030
Loss to be reclassified from other comprehensive income		1,800,000
Accumulated other comprehensive income				$ 6,810,000		$ 214,000
Gains (losses) on derivative instruments		240,000	(2,935,000)
Fair value of derivatives in net liability position						$ 6,700,000
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments		300,000	$ (2,900,000)
Interest rate swaps, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in accumulated other comprehensive income (loss) from derivatives (effective portion)		$ (4,954,000)
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 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 income				600,000
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)				200,000
Accumulated other comprehensive income	$ 1,200,000			$ 500,000
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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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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