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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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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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