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Accrued Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued Liabilities |  |
Capital expenditures | $ 22,289 | $ 27,427
Operating expenses | 15,557 | 24,980
Interest expense | 13,370 | 44,440
Other | 5,923 | 7,341
Total accrued liabilities | $ 57,139 | $ 104,188

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