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Other Long-Term Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Other Liabilities, Noncurrent [Abstract] |  |
Contract liabilities, net of current portion | $ 32,116 | $ 30,925
Asset retirement obligations | 1,984 | 1,961
Deferred payments related to acquisitions | 637 | 4,963
Employee separation costs | 0 | 1,838
Other | 1,415 | 1,764
Other long-term liabilities | $ 36,152 | $ 41,451

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