Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments (BS Offsetting) (Details 4)

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Derivative Financial Instruments (BS Offsetting) (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]    
Cash collateral received   $ (755)
Derivative Assets [Abstract]    
Gross amounts offset in the statement of financial position (111,458)  
Derivative Assets 153,880  
Derivative Asset, Fair Value, Net [Abstract]    
Gross amounts of recognized assets   473,374
Deriviative Contract [Member]
   
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]    
Cash collateral received (360)  
Derivative Assets [Abstract]    
Gross amounts offset in the statement of financial position   (101,620)
Gross amounts not offset in the statement of financial position - financial instruments (35,205) (62,409)
Derivative Assets   308,590
Derivative Asset, Fair Value, Net [Abstract]    
Gross amounts of recognized assets 300,903  
Net amounts of assets presented in the statement of financial position $ 189,445 $ 371,754