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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 Deficit
Accumulated Other Comprehensive Loss
Total Sterling Stockholders’ Equity
Non-controlling Interests
Beginning balance at Dec. 31, 2018 $ 172,260 $ 271 $ 233,795 $ (4,731) $ (64,934) $ 0 $ 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 (in shares)   (1)            
Stock-based compensation 1,021   1,021       1,021  
Distributions to owners (5,100)           0 (5,100)
Purchase of treasury stock (in shares)   250   250        
Purchase of treasury stock (3,201)     $ (3,201)     (3,201)  
Issuance of stock (in shares)   130   (130)        
Issuance of stock 0   (1,314) $ 1,314     0  
Shares withheld for taxes (in shares)   52   45        
Shares withheld for taxes (564)     $ (564)     (564)  
Ending balance at Mar. 31, 2019 166,277 $ 271 233,502 $ (7,182) (63,119) 0 163,472 2,805
Ending balance (in shares) at Mar. 31, 2019   26,424   632        
Beginning balance at Dec. 31, 2018 172,260 $ 271 233,795 $ (4,731) (64,934) 0 164,401 7,859
Beginning balance (in shares) at Dec. 31, 2018   26,597   467        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 9,726              
Loss on interest rate swap, net of tax 0              
Ending balance at Jun. 30, 2019 174,693 $ 271 233,559 $ (6,688) (55,291) 0 171,851 2,842
Ending balance (in shares) at Jun. 30, 2019   26,466   583        
Beginning balance at Mar. 31, 2019 166,277 $ 271 233,502 $ (7,182) (63,119) 0 163,472 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
Loss on interest rate swap, net of tax 0              
Stock-based compensation 649   649       649  
Issuance of stock (in shares)   49   (49)        
Issuance of stock 0   (494) $ 494     0  
Shares withheld for taxes (in shares)   7            
Shares withheld for taxes (98)   (98)       (98)  
Ending balance at Jun. 30, 2019 174,693 $ 271 233,559 $ (6,688) (55,291) 0 171,851 2,842
Ending balance (in shares) at Jun. 30, 2019   26,466   583        
Beginning balance at Dec. 31, 2019 221,211 $ 283 251,019 $ (6,142) (25,033) (209) 219,918 1,293
Beginning balance (in shares) at Dec. 31, 2019   27,772   518        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 3,215       3,115   3,115 100
Loss on interest rate swap, net of tax (7,061)         (7,061) (7,061)  
Stock-based compensation (in shares)   0            
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 at Mar. 31, 2020 218,930 $ 283 250,689 $ (4,247) (21,918) (7,270) 217,537 1,393
Ending balance (in shares) at Mar. 31, 2020   27,966   316        
Beginning balance at Dec. 31, 2019 221,211 $ 283 251,019 $ (6,142) (25,033) (209) 219,918 1,293
Beginning balance (in shares) at Dec. 31, 2019   27,772   518        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 21,480              
Loss on interest rate swap, net of tax $ (7,114)              
Stock-based compensation (in shares) 211              
Shares withheld for taxes (in shares)       49        
Shares withheld for taxes       $ (700)        
Ending balance at Jun. 30, 2020 $ 241,085 $ 283 253,820 $ (3,435) (3,708) (7,323) 239,637 1,448
Ending balance (in shares) at Jun. 30, 2020   28,034   246        
Beginning 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 Mar. 31, 2020   27,966   316        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 18,265       18,210   18,210 55
Loss on interest rate swap, net of tax (53)         (53) (53)  
Stock-based compensation 3,962   3,962       3,962  
Issuance of stock (in shares)   73   (73)        
Issuance of stock 104   (740) $ 844     104  
Shares withheld for taxes (in shares)   5   3        
Shares withheld for taxes (50)   (18) $ (32)     (50)  
Other (73)   (73)       (73)  
Ending balance at Jun. 30, 2020 $ 241,085 $ 283 $ 253,820 $ (3,435) $ (3,708) $ (7,323) $ 239,637 $ 1,448
Ending balance (in shares) at Jun. 30, 2020   28,034   246