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Consolidated Statement of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid in Capital
Treasury Stock
Retained Deficit
Accumulated Other Comprehensive Loss
Total Sterling Stockholders’ Equity
Non-controlling interests
Balance (in shares) at Dec. 31, 2016   24,987            
Balance at Dec. 31, 2016 $ 108,090 $ 250 $ 208,922   $ (101,738)   $ 107,434 $ 656
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 15,817       11,617   11,617 4,200
Stock-based compensation (in shares)   248            
Stock-based compensation 2,843 $ 3 2,840       2,843  
Stock issued for acquisition (in shares)   1,882            
Stock issued for acquisition 17,061 $ 19 17,042       17,061  
Distribution to owners 0           0 0
Warrants issued to lenders 3,500   3,500       3,500  
Other (in shares)   66            
Other (1,122) $ (1) (1,121)       (1,122) 0
Balance (in shares) at Dec. 31, 2017   27,051            
Balance at Dec. 31, 2017 146,189 $ 271 231,183   (90,121)   141,333 4,856
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 29,540       25,187   25,187 4,353
Stock-based compensation (in shares)   40            
Stock-based compensation 3,064   3,064       3,064  
Distribution to owners (1,350)           0 (1,350)
Shares withheld for taxes (in shares)   (27)            
Shares withheld for taxes (452)   (452)       (452)  
Purchase of Treasury Stock (in shares)   (467)   (467)        
Purchase of Treasury Stock (4,731)     $ (4,731)     (4,731)  
Balance (in shares) at Dec. 31, 2018   26,597   467        
Balance at Dec. 31, 2018 172,260 $ 271 233,795 $ (4,731) (64,934)   164,401 7,859
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 40,695       39,901   39,901 794
Other Comprehensive Income (Loss), Net of Tax (209)         $ (209) (209)  
Stock-based compensation (in shares)   (1)            
Stock-based compensation 3,788 $ 0 3,788       3,788  
Stock issued for acquisition (in shares)   1,245            
Stock issued for acquisition 16,195 $ 12 16,183       16,195  
Distribution to owners (7,360)           0 (7,360)
Issuance of stock (in shares)   273   (273)        
Issuance of stock 152   (2,599) $ 2,751     152  
Shares withheld for taxes (in shares)   (92)   (74)        
Shares withheld for taxes (1,109)   (148) $ (961)     (1,109)  
Purchase of Treasury Stock (in shares)   (250)   (250)        
Purchase of Treasury Stock (3,201)     $ (3,201)     (3,201)  
Balance (in shares) at Dec. 31, 2019   27,772   518        
Balance at Dec. 31, 2019 $ 221,211 $ 283 $ 251,019 $ (6,142) $ (25,033) $ (209) $ 219,918 $ 1,293