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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
Retained Deficit
Treasury Stock
Total Sterling Stockholders’ Equity
Non-controlling Interests
Beginning balance at Dec. 31, 2017 $ 146,189 $ 271 $ 231,183 $ (90,121) $ 0 $ 141,333 $ 4,856
Beginning balance (in shares) at Dec. 31, 2017   27,051     0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 3,680     2,489   2,489 1,191
Stock-based compensation 617   617     617  
Stock-based compensation (in shares)   (3)          
Shares withheld for taxes (194) $ (1) (193)     (194)  
Shares withheld for taxes (in shares)   13          
Ending balance at Mar. 31, 2018 150,292 $ 270 231,607 (87,632) $ 0 144,245 6,047
Ending balance (in shares) at Mar. 31, 2018   27,035     0    
Beginning balance at Dec. 31, 2017 146,189 $ 271 231,183 (90,121) $ 0 141,333 4,856
Beginning balance (in shares) at Dec. 31, 2017   27,051     0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 22,989            
Ending balance at Sep. 30, 2018 169,701 $ 271 233,056 (70,541) $ 0 162,786 6,915
Ending balance (in shares) at Sep. 30, 2018   27,068     0    
Beginning balance at Mar. 31, 2018 150,292 $ 270 231,607 (87,632) $ 0 144,245 6,047
Beginning balance (in shares) at Mar. 31, 2018   27,035     0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 9,141     8,174   8,174 967
Stock-based compensation 766   766     766  
Stock-based compensation (in shares)   39          
Shares withheld for taxes (107) $ 1 (108)     (107)  
Shares withheld for taxes (in shares)   10          
Ending balance at Jun. 30, 2018 160,092 $ 271 232,265 (79,458) $ 0 153,078 7,014
Ending balance (in shares) at Jun. 30, 2018   27,064     0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 10,168     8,917   8,917 1,251
Stock-based compensation 798   798     798  
Stock-based compensation (in shares)   4          
Distributions to owners (1,350)           (1,350)
Shares withheld for taxes (7)   (7)     (7)  
Ending balance at Sep. 30, 2018 169,701 $ 271 233,056 (70,541) $ 0 162,786 6,915
Ending balance (in shares) at Sep. 30, 2018   27,068     0    
Beginning balance at Dec. 31, 2018 172,260 $ 271 233,795 (64,934) $ (4,731) 164,401 7,859
Beginning balance (in shares) at Dec. 31, 2018   26,597     467    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 1,861     1,815   1,815 46
Stock-based compensation 1,021   1,021     1,021  
Stock-based compensation (in shares)   (1)          
Distributions to owners (5,100)           (5,100)
Purchase of treasury stock (3,201)       $ (3,201) (3,201)  
Purchase of treasury stock (in shares)   250     250    
Issuance of stock     (1,314)   $ 1,314    
Issuance of stock (in shares)   130     (130)    
Shares withheld for taxes (564)       $ (564) (564)  
Shares withheld for taxes (in shares)   52     45    
Ending balance at Mar. 31, 2019 166,277 $ 271 233,502 (63,119) $ (7,182) 163,472 2,805
Ending balance (in shares) at Mar. 31, 2019   26,424     632    
Beginning balance at Dec. 31, 2018 172,260 $ 271 233,795 (64,934) $ (4,731) 164,401 7,859
Beginning balance (in shares) at Dec. 31, 2018   26,597     467    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income $ 18,235            
Stock-based compensation (in shares) 192            
Ending balance at Sep. 30, 2019 $ 183,259 $ 271 234,309 (47,334) $ (6,581) 180,665 2,594
Ending balance (in shares) at Sep. 30, 2019   26,476     573    
Beginning balance at Mar. 31, 2019 166,277 $ 271 233,502 (63,119) $ (7,182) 163,472 2,805
Beginning balance (in shares) at Mar. 31, 2019   26,424     632    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 7,865     7,828   7,828 37
Stock-based compensation 649   649     649  
Issuance of stock     (494)   $ 494    
Issuance of stock (in shares)   49     (49)    
Shares withheld for taxes (98)   (98)     (98)  
Shares withheld for taxes (in shares)   7          
Ending balance at Jun. 30, 2019 174,693 $ 271 233,559 (55,291) $ (6,688) 171,851 2,842
Ending balance (in shares) at Jun. 30, 2019   26,466     583    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 8,509     7,957   7,957 552
Stock-based compensation 819   819     819  
Distributions to owners (800)           (800)
Issuance of stock 70   (69)   $ 139 70  
Issuance of stock (in shares)   13     (13)    
Shares withheld for taxes (32)       $ (32) (32)  
Shares withheld for taxes (in shares)   3     3    
Ending balance at Sep. 30, 2019 $ 183,259 $ 271 $ 234,309 $ (47,334) $ (6,581) $ 180,665 $ 2,594
Ending balance (in shares) at Sep. 30, 2019   26,476     573