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Plateau Acquisition - Supplemental Pro Forma Information (Details) - Plateau - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Pro forma revenue | $ 1,358,736 | $ 1,326,854
Pro forma net loss attributable to Sterling | $ 90,408 | $ 54,282

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