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Financial Instruments - Fair Value of the Interest Rate Derivative (Details) - Fair Value, Recurring - Interest Rate Swap - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative Liabilities |  |
Other current liabilities | $ (4,076) | $ (4,427)
Other non-current liabilities | (1,799) | (2,629)
Total liabilities at fair value | (5,875) | (7,056)
Level 1 |  |
Derivative Liabilities |  |
Other current liabilities | 0 | 0
Other non-current liabilities | 0 | 0
Total liabilities at fair value | 0 | 0
Level 2 |  |
Derivative Liabilities |  |
Other current liabilities | (4,076) | (4,427)
Other non-current liabilities | (1,799) | (2,629)
Total liabilities at fair value | (5,875) | (7,056)
Level 3 |  |
Derivative Liabilities |  |
Other current liabilities | 0 | 0
Other non-current liabilities | 0 | 0
Total liabilities at fair value | $ 0 | $ 0

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