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Properties (Tables)
 12 Months Ended
Dec. 31, 2012
Properties [Abstract]  
Schedule of Real Estate Properties [Table Text Block]
Properties at December 31, 2012 and December 31, 2011 are summarized as follows:

 
2012
 
2011
Land
$
333,270

 
$
333,375

Buildings, improvements, and equipment
3,749,180

 
3,625,400

Construction in process
116,850

 
15,479

Development pre-construction costs
46,700

 
46,700

 
$
4,246,000

 
$
4,020,954

Accumulated depreciation and amortization
(1,395,876
)
 
(1,271,943
)
 
$
2,850,124

 
$
2,749,011