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Debt (Tables)
3 Months Ended
Mar. 31, 2014
Debt  
Schedule of fair value of fixed rate mortgages and the related discount rate assumptions
 
  March 31,
2014
  December 31,
2013

Fair value of fixed-rate mortgages and unsecured indebtedness

  $23,433   $23,297

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

  3.35%   3.07%