Derivatives (Offsetting Derivatives Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative Liabilities
Derivatives Liabilities, Net Amounts of Liabilities presented in the Statement of Financial Position	$ 52,796	$ 30,888
Interest Rate Swap [Member]
Derivative Liabilities
Derivative Liabilities, Gross Amounts of Recognized Liabilities	47,520	28,158
Derivative Liabilities, Gross Amounts Offset in the Statement of Financial Position	0	0
Derivatives Liabilities, Net Amounts of Liabilities presented in the Statement of Financial Position	47,520	28,158
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	(131)
Derivative Liabilities, Gross Amounts Not Offset in the Statement of Financial Position, Collateral Posted	(47,520)	(28,027)
Derivative Liabilities, Net Amount	$ 0	$ 0