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Financial Instruments - Fair Value of the Interest Rate Derivative (Details) - Fair Value, Recurring - Interest Rate Swap - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Other current liabilities $ (3,529) $ (4,427)
Other non-current liabilities (455) (2,629)
Total liabilities at fair value (3,984) (7,056)
Level 1    
Derivative [Line Items]    
Other current liabilities 0 0
Other non-current liabilities 0 0
Total liabilities at fair value 0 0
Level 2    
Derivative [Line Items]    
Other current liabilities (3,529) (4,427)
Other non-current liabilities (455) (2,629)
Total liabilities at fair value (3,984) (7,056)
Level 3    
Derivative [Line Items]    
Other current liabilities 0 0
Other non-current liabilities 0 0
Total liabilities at fair value $ 0 $ 0