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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Restricted Stock Units and Awards
Performance share units
Common Stock
Common Stock
Restricted Stock Units and Awards
Common Stock
Performance share units
Treasury Shares
Additional Paid-In Capital
Additional Paid-In Capital
Restricted Stock Units and Awards
Additional Paid-In Capital
Performance share units
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Common stock, beginning balance (in shares) at Dec. 31, 2020       134,144                
Treasury stock, beginning balance (in shares) at Dec. 31, 2020             80,045          
Beginning balance at Dec. 31, 2020 $ 702,620     $ 1,341     $ (595,297) $ 740,970     $ 557,875 $ (2,269)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 80,507                   80,507  
Other comprehensive income 1,071                     1,071
Share repurchases (in shares)             2,686          
Share repurchases (84,883)           $ (84,883)          
Indirect repurchase of shares for minimum tax withholding (in shares)             92          
Indirect repurchase of shares for minimum tax withholding (3,037)           $ (3,037)          
Restricted stock units and awards and Performance share units (in shares)       80                
Restricted stock units and awards and Performance share units 0     $ 1       (1)        
Stock options exercised (in shares)       635                
Stock options exercised 7,143     $ 6       7,137        
Stock-based compensation 8,359             8,359        
Business acquisitions (in shares)       274                
Business acquisitions 8,867     $ 3       8,864        
Common stock, ending balance (in shares) at Sep. 30, 2021       135,133                
Treasury stock, ending balance (in shares) at Sep. 30, 2021             82,823          
Ending balance at Sep. 30, 2021 720,647     $ 1,351     $ (683,217) 765,329     638,382 (1,198)
Common stock, beginning balance (in shares) at Jun. 30, 2021       134,892                
Treasury stock, beginning balance (in shares) at Jun. 30, 2021             82,173          
Beginning balance at Jun. 30, 2021 712,332     $ 1,349     $ (661,772) 757,421     616,691 (1,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 21,691                   21,691  
Other comprehensive income 159                     159
Share repurchases (in shares)             650          
Share repurchases (21,445)           $ (21,445)          
Stock options exercised (in shares)       142                
Stock options exercised 1,695     $ 1       1,694        
Stock-based compensation 2,905             2,905        
Business acquisitions (in shares)       99                
Business acquisitions 3,310     $ 1       3,309        
Common stock, ending balance (in shares) at Sep. 30, 2021       135,133                
Treasury stock, ending balance (in shares) at Sep. 30, 2021             82,823          
Ending balance at Sep. 30, 2021 720,647     $ 1,351     $ (683,217) 765,329     638,382 (1,198)
Common stock, beginning balance (in shares) at Dec. 31, 2021       135,187                
Treasury stock, beginning balance (in shares) at Dec. 31, 2021             83,149          
Beginning balance at Dec. 31, 2021 704,548     $ 1,352     $ (694,716) 770,117     628,762 (967)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 116,852                   116,852  
Other comprehensive income 4,584                     4,584
Share repurchases (in shares)             1,628          
Share repurchases (67,976)           $ (67,976)          
Indirect repurchase of shares for minimum tax withholding (in shares)             188          
Indirect repurchase of shares for minimum tax withholding $ (7,289)           $ (7,289)          
Restricted stock units and awards and Performance share units (in shares)         120 211            
Restricted stock units and awards and Performance share units   $ 0 $ 0   $ 1 $ 2     $ (1) $ (2)    
Stock options exercised (in shares) 541     541                
Stock options exercised $ 7,994     $ 5       7,989        
Stock-based compensation 11,987             11,987        
Business acquisitions (in shares)       87                
Business acquisitions 3,425     $ 1       3,424        
Common stock, ending balance (in shares) at Sep. 30, 2022       136,146                
Treasury stock, ending balance (in shares) at Sep. 30, 2022             84,965          
Ending balance at Sep. 30, 2022 774,125     $ 1,361     $ (769,981) 793,514     745,614 3,617
Common stock, beginning balance (in shares) at Jun. 30, 2022       135,823                
Treasury stock, beginning balance (in shares) at Jun. 30, 2022             84,221          
Beginning balance at Jun. 30, 2022 764,523     $ 1,358     $ (737,559) 781,142     718,144 1,438
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 27,470                   27,470  
Other comprehensive income 2,179                     2,179
Share repurchases (in shares)             744          
Share repurchases (32,422)           $ (32,422)          
Restricted stock units and awards and Performance share units (in shares)         1              
Stock options exercised (in shares)       254                
Stock options exercised 4,098     $ 2       4,096        
Stock-based compensation 5,559             5,559        
Business acquisitions (in shares)       68                
Business acquisitions 2,718     $ 1       2,717        
Common stock, ending balance (in shares) at Sep. 30, 2022       136,146                
Treasury stock, ending balance (in shares) at Sep. 30, 2022             84,965          
Ending balance at Sep. 30, 2022 $ 774,125     $ 1,361     $ (769,981) $ 793,514     $ 745,614 $ 3,617