Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Allowance For credit loss, Expected Loss Rate	42.00%
Due from Employees	$ 46,161	$ 43,670
2020	741
2019	445
2018	177
2017	737
2016	484
2015 and prior	3,149
Total	5,733
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,673
Additions and other adjustments	561
Ending balance	$ 4,234
Maximum [Member] | Notes Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
Service Period	10 years
Minimum [Member] | Notes Receivable
Financing Receivable, Credit Quality Indicator [Line Items]
Service Period	3 years
Notes Receivable, Five years and Older [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	$ 3,100
Notes Receivable, Under Five Years [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	$ 1,100