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Derivative Instruments Derivative Instruments (Details 3) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Collateral Already Posted, Aggregate Fair Value $ 200,000 $ 0
Derviative Instrument by Counterparty, Gross Amount Recognized on Balance Sheet [Member]
   
Derivative [Line Items]    
Derivative Assets 22,900,000 11,800,000
Derivative Liabilities 200,000 300,000
Derviative Instrument by Counterparty, Gross Amount Not Offset on Balance Sheet [Member] [Member]
   
Derivative [Line Items]    
Collateral Already Posted, Aggregate Fair Value 0 0
Derivative Assets 0 0
Derivative Liabilities 0 0
Derviative Instrument by Counterparty, Net Amount [Member]
   
Derivative [Line Items]    
Derivative Assets 22,900,000 11,800,000
Derivative Liabilities $ 200,000 $ 300,000