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Financial Instruments - Credit Losses (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]          
Due from Employees $ 55,098,000   $ 55,098,000   $ 46,161,000
2020 980,000   980,000    
2019 644,000   644,000    
2018 444,000   444,000    
2017 173,000   173,000    
2016 662,000   662,000    
2016 and prior 3,491,000   3,491,000    
Total 6,394,000   6,394,000    
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 4,701,000 $ 3,903,000 4,234,000 $ 3,673,000  
Additions and other adjustments 28,000 287,000 495,000 517,000  
Ending balance 4,729,000 $ 4,190,000 $ 4,729,000 $ 4,190,000  
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   $ 3,500,000    
Notes Receivable, Under Five Years [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance $ 1,200,000   $ 1,200,000