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Derivatives and Hedging Activities - Narrative (Details) € in Millions, £ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) derivative | Sep. 30, 2018 USD ($) derivative | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 GBP (£)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Loss for accelerated reclassification of amounts in other comprehensive income to earnings | $ 100,000 |  | $ 90,899 | $ 100,000 | $ 100,000 |  |  |
Loss to be reclassified from other comprehensive income |  |  |  | 2,000,000.0 |  |  |  |
Accumulated other comprehensive (loss) income | (14,618,000) |  |  | (14,618,000) |  |  | $ 6,810,000 |
Gains (losses) on derivative instruments | 3,044,000 |  | 1,290,000 | 4,674,000 | 4,688,000 |  |  |
Fair value of derivatives in net liability position | 11,500,000 |  |  | 11,500,000 |  |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Gains (losses) on derivative instruments | 3,100,000 |  | 1,400,000 | 4,800,000 | 4,800,000 |  |  |
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) | (4,139,000) |  |  | (13,250,000) |  |  |  |
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 | (400,000) |  |  | (400,000) |  |  |  |
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 | $ (300,000) |  | $ (1,200,000) | $ (300,000) | $ (1,200,000) |  |  |
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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