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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid in Capital
Treasury Stock
Retained Earnings (Deficit)
Accumulated Other Comprehensive Loss
Total Sterling Stockholders’ Equity
Non-controlling Interests
Balance (in shares) at Dec. 31, 2017   27,051   0        
Balance at Dec. 31, 2017 $ 146,189 $ 271 $ 231,183 $ 0 $ (90,121) $ 0 $ 141,333 $ 4,856
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 29,540       25,187   25,187 4,353
Change in interest rate swap 0              
Stock-based compensation (in shares)   40            
Stock-based compensation 3,064   3,064       3,064  
Distributions to owners (1,350)           0 (1,350)
Purchase of treasury stock (in shares)   467   467        
Purchase of Treasury Stock (4,731)     $ (4,731)     (4,731)  
Shares withheld for taxes (in shares)   27            
Shares withheld for taxes (452)   (452)       (452)  
Balance (in shares) at Dec. 31, 2018   26,597   467        
Balance at Dec. 31, 2018 172,260 $ 271 233,795 $ (4,731) (64,934) 0 164,401 7,859
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 40,695       39,901   39,901 794
Change in interest rate swap (209)         (209) (209)  
Stock-based compensation (in shares)   (1)            
Stock-based compensation 3,788   3,788       3,788  
Distributions to owners (7,360)           0 (7,360)
Purchase of treasury stock (in shares)   250   250        
Purchase of Treasury Stock (3,201)     $ (3,201)     (3,201)  
Stock issued for acquisition (in shares)   1,245            
Stock issued for acquisition 16,195 $ 12 16,183       16,195  
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)  
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 42,904       42,306   42,306 598
Change in interest rate swap (5,055)         (5,055) (5,055)  
Stock-based compensation 11,643   11,643       11,643  
Distributions to owners (432)           0 (432)
Issuance of stock (in shares)   546   546        
Issuance of stock 530   (6,012) $ 6,542     530  
Shares withheld for taxes (in shares)   134   123        
Shares withheld for taxes (1,985)   (140) $ (1,845)     (1,985)  
Other (87)   (87)       (87)  
Balance (in shares) at Dec. 31, 2020   28,184   95        
Balance at Dec. 31, 2020 $ 268,729 $ 283 $ 256,423 $ (1,445) $ 17,273 $ (5,264) $ 267,270 $ 1,459