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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2013
Stockholders' Equity Note [Abstract]  
Summary of Unit Redemptions [Table Text Block] The following is a summary of Unit redemptions during 2012 and the first nine months of 2013:

Redemption Date
 
Total Requested
Unit Redemptions at
Redemption Date
   
Units
Redeemed
   
Total Redemption
Requests not
Redeemed at
Redemption Date
 
First Quarter 2012
    18,910,430       454,405       18,456,025  
Second Quarter 2012
    18,397,381       454,638       17,942,743  
Third Quarter 2012
    18,607,044       362,553       18,244,491  
Fourth Quarter 2012
    19,112,925       391,142       18,721,783  
First Quarter 2013
    19,485,287       434,573       19,050,714  
Second Quarter 2013
    20,938,382       657,736       20,280,646