Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Schedule of Constant Maturity Swaps (Details)

v2.4.0.8
Derivative Instruments and Hedging Activities Schedule of Constant Maturity Swaps (Details) (Swap [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Derivative [Line Items]  
Derivative, Average Strike Swap Rate 0.821%
Derivative, Notional Amount $ 10,000,000
Derivative, Fair Value, Net (3,773)
Derivative, Cost 0
Derivative, Unrealized Gains (Losses) (3,773)
Determination Date, February 2014 [Member]
  
Derivative [Line Items]  
Derivative, Average Strike Swap Rate 0.768%
Derivative, Notional Amount 3,000,000
Derivative, Fair Value, Net 625
Derivative, Cost 0
Derivative, Unrealized Gains (Losses) 625
Determination Date, March 2014 [Member]
  
Derivative [Line Items]  
Derivative, Average Strike Swap Rate 0.85%
Derivative, Notional Amount 5,000,000
Derivative, Fair Value, Net (3,171)
Derivative, Cost 0
Derivative, Unrealized Gains (Losses) (3,171)
Determination Date, June 2014 [Member]
  
Derivative [Line Items]  
Derivative, Average Strike Swap Rate 0.828%
Derivative, Notional Amount 2,000,000
Derivative, Fair Value, Net (1,227)
Derivative, Cost 0
Derivative, Unrealized Gains (Losses) $ (1,227)