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Financial Instruments - Fair Value of the Interest Rate Derivative (Details) - Fair Value, Recurring - Interest Rate Swap - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative Assets |  |
Other current assets | $ 0 | $ 216
Other non-current assets | 0 | 0
Total assets at fair value | 0 | 216
Derivative Liability [Abstract] |  |
Other current liabilities | (4,427) | (61)
Other non-current liabilities | (2,629) | (398)
Total liabilities at fair value | (7,056) | (459)
Level 1 |  |
Derivative Assets |  |
Other current assets | 0 | 0
Other non-current assets | 0 | 0
Total assets at fair value | 0 | 0
Derivative Liability [Abstract] |  |
Other current liabilities | 0 | 0
Other non-current liabilities | 0 | 0
Total liabilities at fair value | 0 | 0
Level 2 |  |
Derivative Assets |  |
Other current assets | 0 | 216
Other non-current assets | 0 | 0
Total assets at fair value | 0 | 216
Derivative Liability [Abstract] |  |
Other current liabilities | (4,427) | (61)
Other non-current liabilities | (2,629) | (398)
Total liabilities at fair value | (7,056) | (459)
Level 3 |  |
Derivative Assets |  |
Other current assets | 0 | 0
Other non-current assets | 0 | 0
Total assets at fair value | 0 | 0
Derivative Liability [Abstract] |  |
Other current liabilities | 0 | 0
Other non-current liabilities | 0 | 0
Total liabilities at fair value | $ 0 | $ 0

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