Significant Accounting Policies Property and Equipment Useful Life Table (Details)	12 Months Ended
	Dec. 31, 2020
Building
Property, Plant and Equipment [Line Items]
Useful life (in years)	39 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	10 years
Office and computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Office and computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	7 years
Furniture | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Furniture | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	7 years
Vehicle
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Website development
Property, Plant and Equipment [Line Items]
Useful life (in years)	7 years