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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Total Sterling Stockholders’ Equity
Common Stock
Additional Paid in Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive (Loss) Gain
Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2020     28,184          
Beginning balance (in shares) at Dec. 31, 2020         95      
Beginning balance at Dec. 31, 2020 $ 268,729 $ 267,270 $ 283 $ 256,423 $ (1,445) $ 17,273 $ (5,264) $ 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)             (1,959)
Issuance of stock (in shares)     668   (111)      
Issuance of stock 144 144 $ 5 (1,602) $ 1,741      
Shares withheld for taxes (in shares)     (246)   (16)      
Shares withheld for taxes (5,619) (5,619) $ (2) (5,321) $ (296)      
Ending balance (in shares) at Mar. 31, 2021     28,606          
Ending balance (in shares) at Mar. 31, 2021         0      
Ending balance at Mar. 31, 2021 275,693 275,080 $ 286 251,335 $ 0 27,828 (4,369) 613
Beginning balance (in shares) at Dec. 31, 2020     28,184          
Beginning balance (in shares) at Dec. 31, 2020         95      
Beginning balance at Dec. 31, 2020 268,729 267,270 $ 283 256,423 $ (1,445) 17,273 (5,264) 1,459
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 53,642              
Change in interest rate swap 2,341              
Ending balance (in shares) at Sep. 30, 2021     28,782          
Ending balance (in shares) at Sep. 30, 2021         0      
Ending balance at Sep. 30, 2021 323,093 321,688 $ 288 255,313 $ 0 69,010 (2,923) 1,405
Beginning balance (in shares) at Mar. 31, 2021     28,606          
Beginning balance (in shares) at Mar. 31, 2021         0      
Beginning balance at Mar. 31, 2021 275,693 275,080 $ 286 251,335 $ 0 27,828 (4,369) 613
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 20,217 20,056       20,056   161
Change in interest rate swap 728 728         728  
Stock-based compensation 2,015 2,015   2,015        
Issuance of stock (in shares)     32          
Issuance of stock 120 120   120        
Other (3) (3)   (3)        
Ending balance (in shares) at Jun. 30, 2021     28,638          
Ending balance (in shares) at Jun. 30, 2021         0      
Ending balance at Jun. 30, 2021 298,770 297,996 $ 286 253,467 $ 0 47,884 (3,641) 774
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 21,757 21,126       21,126   631
Change in interest rate swap 718 718         718  
Stock-based compensation 1,840 1,840   1,840        
Issuance of stock (in shares)     148          
Issuance of stock 107 107 $ 2 105        
Shares withheld for taxes (in shares)     (4)          
Shares withheld for taxes (99) (99)   (99)        
Ending balance (in shares) at Sep. 30, 2021     28,782          
Ending balance (in shares) at Sep. 30, 2021         0      
Ending balance at Sep. 30, 2021 $ 323,093 321,688 $ 288 255,313 $ 0 69,010 (2,923) 1,405
Beginning balance (in shares) at Dec. 31, 2021 29,838   29,838          
Beginning balance at Dec. 31, 2021 $ 360,227 358,767 $ 298 280,274   79,918 (1,723) 1,460
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 19,523 19,252       19,252   271
Change in interest rate swap 1,563 1,563         1,563  
Stock-based compensation 3,521 3,521   3,521        
Issuance of stock (in shares)     688          
Issuance of stock 192 192 $ 7 185        
Shares withheld for taxes (in shares)     (263)          
Shares withheld for taxes (7,386) (7,386) $ (3) (7,383)        
Ending balance (in shares) at Mar. 31, 2022     30,263          
Ending balance at Mar. 31, 2022 $ 377,640 375,909 $ 302 276,597   99,170 (160) 1,731
Beginning balance (in shares) at Dec. 31, 2021 29,838   29,838          
Beginning balance at Dec. 31, 2021 $ 360,227 358,767 $ 298 280,274   79,918 (1,723) 1,460
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 76,052              
Change in interest rate swap $ 2,301              
Ending balance (in shares) at Sep. 30, 2022 29,838   30,318          
Ending balance at Sep. 30, 2022 $ 439,887 437,111 $ 303 281,576   154,654 578 2,776
Beginning balance (in shares) at Mar. 31, 2022     30,263          
Beginning balance at Mar. 31, 2022 377,640 375,909 $ 302 276,597   99,170 (160) 1,731
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 26,372 25,961       25,961   411
Change in interest rate swap 839 839         839  
Stock-based compensation 2,333 2,333   2,333        
Issuance of stock (in shares)     36          
Issuance of stock 191 191 $ 1 190        
Ending balance (in shares) at Jun. 30, 2022     30,299          
Ending balance at Jun. 30, 2022 407,375 405,233 $ 303 279,120   125,131 679 2,142
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 30,157 29,523       29,523   634
Change in interest rate swap (101) (101)         (101)  
Stock-based compensation 2,436 2,436   2,436        
Issuance of stock (in shares)     24          
Issuance of stock 155 155   155        
Shares withheld for taxes (in shares)     (5)          
Shares withheld for taxes $ (135) (135)   (135)        
Ending balance (in shares) at Sep. 30, 2022 29,838   30,318          
Ending balance at Sep. 30, 2022 $ 439,887 $ 437,111 $ 303 $ 281,576   $ 154,654 $ 578 $ 2,776