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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
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