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, 2020	Dec. 31, 2019
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	$ (17,072)	$ (6,008)
Designated as Hedging Instrument | Interest rate swaps, net | USD | Derivatives liabilities, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	(5,495)	(939)
Designated as Hedging Instrument | Interest rate swaps, net | GBP | Derivatives liabilities, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	(9,173)	(4,524)
Designated as Hedging Instrument | Interest rate swaps, net | GBP | Derivatives assets, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	0	366
Designated as Hedging Instrument | Interest rate swaps, net | EUR | Derivatives liabilities, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	(2,404)	(1,139)
Designated as Hedging Instrument | Interest rate swaps, net | EUR | Derivatives assets, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	0	228
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	424	2,652
Not Designated as Hedging Instrument | Interest rate swaps, net | EUR | Derivatives liabilities, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	0	(74)
Not Designated as Hedging Instrument | Foreign currency forwards | GBP | Derivatives liabilities, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	(1,020)	(831)
Not Designated as Hedging Instrument | Foreign currency forwards | GBP | Derivatives assets, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	1,018	1,205
Not Designated as Hedging Instrument | Foreign currency forwards | EUR | Derivatives liabilities, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	(454)	0
Not Designated as Hedging Instrument | Foreign currency forwards | EUR | Derivatives assets, at fair value
Derivatives, Fair Value [Line Items]
Derivatives, at fair value	$ 880	$ 2,352