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Condensed Consolidated Statements of Changes in 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
Beginning balance (in shares) at Dec. 31, 2019   27,772   518        
Beginning 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 3,215       3,115   3,115 100
Change in interest rate swap (7,061)         (7,061) (7,061)  
Stock-based compensation 2,234   2,234       2,234  
Issuance of stock (in shares)   248   248        
Issuance of stock 103   (2,460) $ 2,563     103  
Shares withheld for taxes (in shares)   54   46        
Shares withheld for taxes (772)   (104) $ (668)     (772)  
Ending balance (in shares) at Mar. 31, 2020   27,966   316        
Ending balance at Mar. 31, 2020 218,930 $ 283 250,689 $ (4,247) (21,918) (7,270) 217,537 1,393
Beginning balance (in shares) at Dec. 31, 2020   28,184   95        
Beginning balance at Dec. 31, 2020 268,729 $ 283 256,423 $ (1,445) 17,273 (5,264) 267,270 1,459
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 11,668       10,555   10,555 1,113
Change in interest rate swap 895         895 895  
Stock-based compensation 1,835   1,835       1,835  
Distributions to owners (1,959)           0 (1,959)
Issuance of stock (in shares)   668   111        
Issuance of stock 144 $ 5 (1,602) $ 1,741     144  
Shares withheld for taxes (in shares)   (246)   (16)        
Shares withheld for taxes (5,619) $ (2) (5,321) $ (296)     (5,619)  
Ending balance (in shares) at Mar. 31, 2021   28,606   0        
Ending balance at Mar. 31, 2021 $ 275,693 $ 286 $ 251,335 $ 0 $ 27,828 $ (4,369) $ 275,080 $ 613