Derivative Financial Instruments Offsetting of Derivative Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities Presented in the Consolidated Balance Sheets	$ 1,365	$ 1,553
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	(97)	(182)
Cash Collateral Pledged Not Offset in the Consolidated Balance Sheets	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 1,268	$ 1,371