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Fair Value Measurements - Changes in Financial Instruments Measured at Level 3 (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Contingent consideration    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period $ 123,000  
Interest rate contract 95,000  
Stock compensation activity 64,000  
Balance, end of period 282,000 $ 123,000
Contingent consideration | Interest rate contract    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period (95,000)  
Interest rate contract 95,000  
Stock compensation activity 0  
Balance, end of period 0 (95,000)
Contingent consideration | Stock appreciation rights    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period 218,000  
Interest rate contract 0  
Stock compensation activity 64,000  
Balance, end of period 282,000 218,000
Term Loan    
Financial instruments measured at Level 3 fair value on a recurring basis    
Fair value of debt 271,600,000  
Term Loan | Level 2    
Financial instruments measured at Level 3 fair value on a recurring basis    
Fair value of debt 271,600,000  
Recurring    
Financial instruments measured at Level 3 fair value on a recurring basis    
Transfers between Level 1 to Level 2 0 0
Transfers between Level 2 to Level 1 0 0
Transfers out of Level 3 $ 0 $ 0