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Fair Value Measurements - Changes of Level 3 Financial Instruments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period   $ 123
Stock compensation activity   47
Mark-to-market adjustment   674
Balance, ending period $ 844 844
Liability-classified stock compensation    
Financial instruments measured at Level 3 fair value on a recurring basis rollforward    
Balance, beginning period   218
Stock compensation activity   47
Mark-to-market adjustment   0
Balance, ending period 265 265
Derivative financial instruments, liabilities | Interest rate swap    
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 300 674
Balance, ending period 579 579
Term loan    
Financial instruments measured at Level 3 fair value on a recurring basis    
Fair value of debt $ 391,600 $ 391,600