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Financial Instruments - Carrying And Estimated Fair Value Of Other Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Acquisition-related contingent consideration, including current portion $ 20,118 $ 14,826
Long-term debt 286,131 275,609
Total 306,249 290,435
Level 1 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Acquisition-related contingent consideration, including current portion 0 0
Long-term debt 0 0
Total 0 0
Level 2 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Acquisition-related contingent consideration, including current portion 0 0
Long-term debt 396,982 398,016
Total 396,982 398,016
Level 3 | Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Acquisition-related contingent consideration, including current portion 20,118 14,826
Long-term debt 0 0
Total $ 20,118 $ 14,826