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Fair Value Measurement - Change in Fair Value Of Liability (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at June 30, 2021 $ 700
Long term Debt  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at December 31, 2020 900
Long term Debt | Phantom Stock Appreciation Rights Psars Liability [Member]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at December 31, 2020 858
Change in fair value (132)
Balance at June 30, 2021 $ 726