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Acquisitions - Supplemental Pro Forma Information (Details) - Petillo - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Pro forma revenue | $ 1,617,742 | $ 1,449,422
Pro forma net income attributable to Sterling | $ 74,426 | $ 58,507

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