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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 (Deficit)
Accumulated Other Comprehensive Loss
Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2019     27,772   518      
Beginning balance at Dec. 31, 2019 $ 221,211 $ 219,918 $ 283 $ 251,019 $ (6,142) $ (25,033) $ (209) $ 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 103 103   (2,460) $ 2,563      
Shares withheld for taxes (in shares)     54   46      
Shares withheld for taxes (772) (772)   (104) $ (668)      
Ending balance (in shares) at Mar. 31, 2020     27,966   316      
Ending balance at Mar. 31, 2020 218,930 217,537 $ 283 250,689 $ (4,247) (21,918) (7,270) 1,393
Beginning balance (in shares) at Dec. 31, 2019     27,772   518      
Beginning balance at Dec. 31, 2019 221,211 219,918 $ 283 251,019 $ (6,142) (25,033) (209) 1,293
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 36,877              
Change in interest rate swap (6,104)              
Ending balance (in shares) at Sep. 30, 2020     28,086   194      
Ending balance at Sep. 30, 2020 259,316 257,628 $ 283 254,860 $ (2,651) 11,449 (6,313) 1,688
Beginning balance (in shares) at Mar. 31, 2020     27,966   316      
Beginning balance at Mar. 31, 2020 218,930 217,537 $ 283 250,689 $ (4,247) (21,918) (7,270) 1,393
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 18,265 18,210       18,210   55
Change in interest rate swap (53) (53)         (53)  
Stock-based compensation 3,962 3,962   3,962        
Issuance of stock (in shares)     73   73      
Issuance of stock 104 104   (740) $ 844      
Shares withheld for taxes (in shares)     5   3      
Shares withheld for taxes (50) (50)   (18) $ (32)      
Other (73) (73)   (73)        
Ending balance (in shares) at Jun. 30, 2020     28,034   246      
Ending balance at Jun. 30, 2020 241,085 239,637 $ 283 253,820 $ (3,435) (3,708) (7,323) 1,448
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 15,397 15,157       15,157   240
Change in interest rate swap 1,010 1,010         1,010  
Stock-based compensation 1,765 1,765   1,765        
Issuance of stock (in shares)     66   66      
Issuance of stock 203 203   (714) $ 917      
Shares withheld for taxes (in shares)     14   14      
Shares withheld for taxes (133) (133)     $ (133)      
Other (11) (11)   (11)        
Ending balance (in shares) at Sep. 30, 2020     28,086   194      
Ending balance at Sep. 30, 2020 259,316 257,628 $ 283 254,860 $ (2,651) 11,449 (6,313) 1,688
Beginning balance (in shares) at Dec. 31, 2020     28,184   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) 0           (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   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   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   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   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   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   0      
Ending balance at Sep. 30, 2021 $ 323,093 $ 321,688 $ 288 $ 255,313 $ 0 $ 69,010 $ (2,923) $ 1,405