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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other Liabilities, Noncurrent [Abstract] |  |
Contract liabilities, net of current portion | $ 34,866 | $ 30,925
Asset retirement obligations | 7,647 | 1,961
Deferred payments related to acquisitions | 715 | 4,963
Employee separation costs | 0 | 1,838
Other | 2,827 | 1,764
Other long-term liabilities | $ 46,055 | $ 41,451

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