text: February 1, 2014. 
  2 Based upon the estimated lease liability as of the end of the period, calculated as the trailing 12 months of rent expense multiplied by eight. The multiple of eight times rent 
  
  expense is a commonly used method of estimating the debt we would record for our leases that are classified as operating if they had met the criteria for a capital lease or we 
  had purchased the property. 