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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
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2021     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        
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     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     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 Dec. 31, 2022 30,585   30,585        
Beginning balance at Dec. 31, 2022 $ 477,799 474,599 $ 306 287,914 186,379   3,200
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 20,040 19,649     19,649   391
Stock-based compensation 4,486 4,486   4,486      
Issuance of stock (in shares)     316        
Issuance of stock 218 218 $ 2 216      
Shares withheld for taxes (in shares)     (111)        
Shares withheld for taxes (4,288) (4,288)   (4,288)      
Ending balance (in shares) at Mar. 31, 2023     30,790        
Ending balance at Mar. 31, 2023 $ 498,255 494,664 $ 308 288,328 206,028   3,591
Beginning balance (in shares) at Dec. 31, 2022 30,585   30,585        
Beginning balance at Dec. 31, 2022 $ 477,799 474,599 $ 306 287,914 186,379   3,200
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 100,409            
Change in interest rate swap $ 0            
Ending balance (in shares) at Sep. 30, 2023 30,828   30,828        
Ending balance at Sep. 30, 2023 $ 585,474 580,347 $ 308 295,178 284,861   5,127
Beginning balance (in shares) at Mar. 31, 2023     30,790        
Beginning balance at Mar. 31, 2023 498,255 494,664 $ 308 288,328 206,028   3,591
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 40,230 39,480     39,480   750
Stock-based compensation 3,270 3,270   3,270      
Issuance of stock (in shares)     27        
Issuance of stock 199 199   199      
Shares withheld for taxes (in shares)     (1)        
Shares withheld for taxes (40) (40)   (40)      
Ending balance (in shares) at Jun. 30, 2023     30,816        
Ending balance at Jun. 30, 2023 541,914 537,573 $ 308 291,757 245,508   4,341
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 40,139 39,353     39,353   786
Change in interest rate swap 0            
Stock-based compensation 3,448 3,448   3,448      
Issuance of stock (in shares)     15        
Issuance of stock 240 240   240      
Shares withheld for taxes (in shares)     (3)        
Shares withheld for taxes (251) (251)   (251)      
Other $ (16) (16)   (16)      
Ending balance (in shares) at Sep. 30, 2023 30,828   30,828        
Ending balance at Sep. 30, 2023 $ 585,474 $ 580,347 $ 308 $ 295,178 $ 284,861   $ 5,127