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Offsetting Assets and Liabilities Offsetting Assets (Tables)
 9 Months Ended
Sep. 30, 2013
Offsetting Assets [Line Items]  
Offsetting Assets [Table Text Block]
 
Offsetting of Assets
 
Gross Amount of Recognized Assets
 
Gross Amount Offset in the Balance Sheet
 
Net Amount of Assets Presented in the Balance Sheet
 
Gross Amount Not Offset in the Balance Sheet
 
Net Amount
Financial Instruments Received as Collateral
 
Cash Received as Collateral
September 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
$
12,908

 
$
—

 
$
12,908

 
$
(1,689
)
 
$
(11,219
)
 
$
—

 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2012:
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—