Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details 2)

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Summary of Significant Accounting Policies (Details 2)
12 Months Ended
Dec. 31, 2011
form
Share-Based Compensation  
Forms of share-based compensation issued in 2010 and 2011 2
Market concentration premium
 
Intangible assets and deferred revenue on real estate acquisitions  
Period during which intangible assets will be amortized (in years) 40