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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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