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Significant Accounting Policies - Depreciation and Amortization (Details)
12 Months Ended
Dec. 31, 2020
Buildings | Minimum  
Property, Plant and Equipment [Line Items]  
Useful life 30 years
Buildings | Maximum  
Property, Plant and Equipment [Line Items]  
Useful life 42 years
Furniture, Fixtures and Equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Useful life 3 years
Furniture, Fixtures and Equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Useful life 5 years