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Derivatives and Hedging Activities - Schedule of Derivatives in Statement of Financial Position, Fair Value (Details) - Swap - Significant Other Observable Inputs Level 2 - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | $ 5,907 | $ (8,881)
Designated as Hedging Instrument | Foreign currency forwards | EUR | Derivatives liabilities, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 0 | (304)
Designated as Hedging Instrument | Cross currency swaps | EUR | Derivatives liabilities, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 0 | (3,328)
Designated as Hedging Instrument | Cross currency swaps | GBP | Derivatives liabilities, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 0 | (1,183)
Designated as Hedging Instrument | Cross currency swaps | GBP | Derivatives assets, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 1,170 | 0
Designated as Hedging Instrument | Interest rate swaps, net | EUR | Derivatives liabilities, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | (1,646) | (2,446)
Designated as Hedging Instrument | Interest rate swaps, net | GBP | Derivatives liabilities, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 0 | (3,713)
Designated as Hedging Instrument | Interest rate swaps, net | GBP | Derivatives assets, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 391 | 0
Designated as Hedging Instrument | Interest rate swaps, net | USD | Derivatives assets, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 5,992 | 2,093
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 1,463 | (4,734)
Not Designated as Hedging Instrument | Foreign currency forwards | EUR | Derivatives liabilities, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | (12) | (1,258)
Not Designated as Hedging Instrument | Foreign currency forwards | EUR | Derivatives assets, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 1,146 | 0
Not Designated as Hedging Instrument | Foreign currency forwards | GBP | Derivatives liabilities, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | (46) | (1,175)
Not Designated as Hedging Instrument | Foreign currency forwards | GBP | Derivatives assets, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 1,709 | 20
Not Designated as Hedging Instrument | Put options | EUR | Derivatives assets, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | 34 | 63
Not Designated as Hedging Instrument | Interest rate swaps, net | EUR | Derivatives liabilities, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives, at fair value | $ (1,368) | $ (2,384)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet. + References No definition available. + Details
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