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Fair Value (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Tables [Abstract]  
Assets Measured at Fair Value on Recurring Basis

The following table presents financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2013 and December 31, 2012:

(in thousands)        
    Quoted Prices    
    in Active Significant  
    Markets for Other Significant
    Identical  Observable Unobservable
  Fair Value Assets Inputs Inputs
  Measurements (Level 1) (Level 2) (Level 3)
June 30, 2013        
Mortgage-backed securities$ 339,148$ -$ 339,148$ -
Eurodollar futures contracts  2,531  2,531  -  -
December 31, 2012        
Mortgage-backed securities$ 115,380$ -$ 115,380$ -