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Commitments (Details 3) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Derivatives Fair Value [Line Items]      
Assets, Fair Value $ 487 $ 171  
Liabilities, Fair Value 487 $ 171  
Other assets      
Derivatives Fair Value [Line Items]      
Assets, Fair Value 487   $ 171
Other liabilities      
Derivatives Fair Value [Line Items]      
Liabilities, Fair Value $ 487   $ 171