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Fair Value Measurements (Details 2) (USD $)
 0 Months Ended
Jun. 30, 2013
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Fair Value Measurements  
Number of mortgage loans outstanding 8
Interest rate derivatives | Cash flow hedge
  
Fair Value Measurements  
Number of interest rate derivatives held 8
Notional amount of interest rate derivatives designated as cash flow hedge $ 36,217,000
Weighted average maturity 4 years 8 months 12 days
Fixed annual interest rate lower end of range (as a percent) 3.55%
Fixed annual interest rate higher end of range (as a percent) 6.50%
Weighted average annual interest rate (as a percent) 4.90%