Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2011
Month
Y
Properties  
Period after the cessation of major construction activities for considering property as operational if leases have not commenced earlier (in years) 1
Period after the cessation of major construction activities for considering property as partially operational if leases have commenced earlier (in years) 1
Cash and Cash Equivalents  
Maximum term until original maturity to classify cash and liquid investments as cash and cash equivalents (in months) 3
Buildings and building improvements
 
Properties  
Estimated useful life, minimum (in years) 10
Estimated useful life, maximum (in years) 40
Land improvements
 
Properties  
Estimated useful life, minimum (in years) 10
Estimated useful life, maximum (in years) 20
Equipment and personal property
 
Properties  
Estimated useful life, minimum (in years) 3
Estimated useful life, maximum (in years) 10