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Derivatives and Hedging Activities - Schedule of Interest Rate Derivatives (Details) - Designated as Hedging Instrument - Cash Flow Hedging - Swap $ in Thousands | Sep. 30, 2019 USD ($) derivative | Dec. 31, 2018 USD ($) derivative
--- | --- | ---
Derivative [Line Items] |  |
Number of Instruments | derivative | 74 | 64
Notional Amount | $ | $ 1,051,786 | $ 596,567
GBP |  |
Derivative [Line Items] |  |
Number of Instruments | derivative | 49 | 48
Notional Amount | $ | $ 271,387 | $ 234,312
EUR |  |
Derivative [Line Items] |  |
Number of Instruments | derivative | 22 | 13
Notional Amount | $ | $ 630,399 | $ 212,255
USD |  |
Derivative [Line Items] |  |
Number of Instruments | derivative | 3 | 3
Notional Amount | $ | $ 150,000 | $ 150,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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