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Summary of Significant Accounting Policies and Procedures and Recent Accounting Pronouncements - Depreciation and Amortization (Details)
12 Months Ended
Dec. 31, 2018
Buildings | Minimum  
Depreciation and Amortization  
Estimated useful life 25 years
Buildings | Maximum  
Depreciation and Amortization  
Estimated useful life 35 years
Building improvements | Minimum  
Depreciation and Amortization  
Estimated useful life 4 years
Building improvements | Maximum  
Depreciation and Amortization  
Estimated useful life 20 years