Summary of Significant Accounting Policies - PP&E Useful Lives (Details)	12 Months Ended
	Dec. 31, 2019
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Useful life	30 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	15 years
Vehicles
Property, Plant and Equipment [Line Items]
Useful life	5 years
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years