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Fair Value Measurements - Changes of Level 3 Financial Instruments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Level 3    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period   $ 123
Stock compensation activity   76
Mark-to-market adjustment   385
Balance, ending period $ 584 584
Liability-classified stock compensation | Level 3    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period   218
Stock compensation activity   76
Mark-to-market adjustment   0
Balance, ending period 294 294
Derivative financial instruments, liabilities | Interest rate swap    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Mark-to-market adjustment 300 (400)
Derivative financial instruments, liabilities | Interest rate swap | Level 3    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period   (95)
Stock compensation activity   0
Mark-to-market adjustment   385
Balance, ending period 290 290
Term loan    
Financial instruments measured at Level 3 fair value on a recurring basis    
Fair value of debt $ 267,400 $ 267,400