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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
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)