Derivatives (Derivative Instruments Consolidated Statement) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Trading Activity, Gains and Losses, Net [Line Items]
Included in Interest Income / (Expense)	$ 18,706	$ 18,321	$ 37,255	$ 36,517
Interest Rate Swap
Trading Activity, Gains and Losses, Net [Line Items]
Included in Interest Income / (Expense)	0	0	0	0
Included in Other Income / (Expense)	$ 107	$ 116	$ 165	$ 78