Derivative and Hedging Activities - Schedule of Derivative Instruments in Statement of Financial Positions, Fair Value (Details) (Significant Other Observable Inputs Level 2, Swap, Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Interest rate swaps, net | Derivative Financial Instruments, Assets
Derivatives, Fair Value [Line Items]
Derivative assets, at fair value	$ 18	$ 734
Interest rate swaps, net | Derivative Financial Instruments, Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities, at fair value	(5,668)	0
Foreign currency swaps | Derivative Financial Instruments, Assets
Derivatives, Fair Value [Line Items]
Derivative assets, at fair value	11,736	0
Foreign currency swaps | Derivative Financial Instruments, Assets | GBP-USD Forwards
Derivatives, Fair Value [Line Items]
Derivative assets, at fair value	1,148	0
Foreign currency swaps | Derivative Financial Instruments, Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities, at fair value	(447)	(2,565)
Foreign currency forwards, net | Derivative Financial Instruments, Assets | EUR-USD Forwards
Derivatives, Fair Value [Line Items]
Derivative assets, at fair value	$ 736	$ 0