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Derivative Financial Instruments (Details 3) - Interest rate swaps - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Offsetting of financial assets and derivative assets    
Gross Amounts of Recognized Assets $ 8,458 $ 9,492
Gross Amounts Offset in the Statement of Financial Position 272 367
Net Amounts of Assets Presented in the Statement of Financial Position 8,186 9,125
Net Amount $ 8,186 $ 9,125