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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Net income attributable to Sterling common stockholders $ 42,306 $ 39,901 $ 25,187
Weighted average common shares outstanding — basic (in shares) 27,859 26,671 26,903
Shares for dilutive unvested stock and warrants (in shares) 336 448 291
Weighted average common shares outstanding — diluted (in shares) 28,195 27,119 27,194
Basic net income (loss) per share attributable to Sterling common stockholders (in usd per share) $ 1.52 $ 1.50 $ 0.94
Diluted net income (loss) per share attributable to Sterling common stockholders (in usd per share) $ 1.50 $ 1.47 $ 0.93