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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, 2018 USD ($) derivative | Dec. 31, 2017 USD ($) derivative
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Derivative [Line Items] |  |
Number of Instruments (derivative) | derivative | 64 | 35
Notional Amount | $ | $ 604,977 | $ 673,345
GBP |  |
Derivative [Line Items] |  |
Number of Instruments (derivative) | derivative | 48 | 19
Notional Amount | $ | $ 239,740 | $ 301,155
EUR |  |
Derivative [Line Items] |  |
Number of Instruments (derivative) | derivative | 13 | 13
Notional Amount | $ | $ 215,237 | $ 222,190
USD |  |
Derivative [Line Items] |  |
Number of Instruments (derivative) | 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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