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Significant Accounting Policies (Details 2)
12 Months Ended
Dec. 31, 2013
Commercial buildings
 
Real Estate and Depreciation  
Estimated useful life 39 years
Building improvements | Minimum
 
Real Estate and Depreciation  
Estimated useful life 15 years
Building improvements | Maximum
 
Real Estate and Depreciation  
Estimated useful life 39 years
Fixtures and equipment | Minimum
 
Real Estate and Depreciation  
Estimated useful life 3 years
Fixtures and equipment | Maximum
 
Real Estate and Depreciation  
Estimated useful life 7 years