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Financial Instruments - Credit Losses (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Expected loss rate 42.70%  
Due from Employees $ 48,847,000 $ 46,161,000
2020 1,064,000  
2019 644,000  
2018 444,000  
2017 173,000  
2016 662,000  
2016 and prior 3,491,000  
Total 6,478,000  
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 4,234,000  
Additions and other adjustments 532,000  
Ending balance $ 4,766,000  
Minimum [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Service Period 3 years  
Maximum [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Service Period 10 years  
Notes Receivable, Five Years and Older [Member]    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Ending balance $ 3,500,000  
Notes Receivable, Under Five Years [Member]    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Ending balance $ 1,300,000