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Notes Payable (Repurchase Agreements Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Debt Disclosure [Abstract]      
Repurchase agreement, maximum amount borrowed   $ 258,600,000 $ 0
Repurchase agreement, average borrowings $ 131,500,000 $ 47,500,000  
Repurchase agreement, weighted average interest rate 0.17% 0.18%