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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net income $ 62,645 $ 42,306 $ 39,901
Weighted average common shares outstanding — basic (in shares) 28,600 27,859 26,671
Shares for dilutive unvested stock and warrants (in shares) 501 336 448
Weighted average common shares outstanding — diluted (in shares) 29,101 28,195 27,119
Basic net income per share attributable to Sterling common stockholders (in usd per share) $ 2.19 $ 1.52 $ 1.50
Diluted net income per share attributable to Sterling common stockholders (in usd per share) $ 2.15 $ 1.50 $ 1.47