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Debt (Tables)
9 Months Ended
Sep. 30, 2013
Debt  
Schedule of fair value of fixed rate mortgages and unsecured indebtedness
 
  September 30,
2013
  December 31,
2012
 

Fair value of fixed-rate mortgages and unsecured indebtedness

  $ 22,140   $ 23,373  

Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages

    3.55%     3.24%