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Operations and Summary of Significant Accounting Policies - PP&E and Other Misc Disclosures (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
bank
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Property, Plant and Equipment [Line Items]      
High end of the range of the required percentage voting interest held to account for investments with the equity method of accounting 50.00%    
Allowance for Doubtful Accounts      
Number of banks where demand deposit or money market accounts are held by the company | bank 17    
Fair Value of Financial Instruments      
United States Treasury securities and money market funds included in cash equivalents $ 45,400 $ 100  
Contingent Consideration for acquisition $ 547 $ 0 $ 0
Depreciation and Amortization      
Weighted-average amortization period 6 years 6 months    
Minimum | Buildings and site improvements      
Depreciation and Amortization      
Estimated useful life 15 years    
Maximum | Buildings and site improvements      
Depreciation and Amortization      
Estimated useful life 45 years