Derivative Instruments (Effect of Derivative Instruments Designated as Cash Flow Hedges (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI	$ 3,099	[1]
Amount of Gain (Loss) Reclassified from AOCI to Income	583
Gain/(Loss) Recognized in Income from Ineffective portion	(2,810)
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI	243	[1]
Gain/(Loss) Recognized in Income from Ineffective portion	49
Interest Rate Swaps [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	484	[2]
De-Designation of Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI	2,859	[1]
Gain/(Loss) Recognized in Income from Ineffective portion	(2,859)
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI	(3)	[1]
Foreign Exchange Contracts [Member] | Other Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCI to Income	$ 99	[2]

[1] Other Comprehensive (Loss) Income

[2] Accumulated Other Comprehensive Income