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Notes Payable Repurchase Agreements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Repurchase Agreements [Abstract]    
Repurchase Agreement, Maximum Amount Borrowed   $ 160.4
Repurchase Agreement, Average Borrowings $ 10.0 $ 5.0
Repurchase Agreement, Average Interest Rate   0.32%