Derivative Financial Instruments Offsetting of Derivative Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Offsetting Liabilities [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 1,553	$ 2,176
Derivative Liability, Fair Value, Gross Assets Not Offset	(182)	(40)
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 1,371	$ 2,136