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Summary of Significant Accounting Policies - Property and Equipment (Details)
12 Months Ended
Dec. 31, 2020
Buildings | Minimum  
PROPERTY AND EQUIPMENT  
Estimated Useful Lives 10 years
Buildings | Maximum  
PROPERTY AND EQUIPMENT  
Estimated Useful Lives 50 years
Equipment | Minimum  
PROPERTY AND EQUIPMENT  
Estimated Useful Lives 2 years
Equipment | Maximum  
PROPERTY AND EQUIPMENT  
Estimated Useful Lives 20 years