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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Noncontrolling Interest [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common Stock, Shares, Outstanding   85,715,000          
Common Stock, Value, Issued   $ 6          
Additional paid-in capital       $ 424,835      
Retained earnings         $ 1,217,521    
Accumulated other comprehensive loss           $ (32,628)  
Treasury stock-shares at cost             46,276,000
Treasury Stock, Value             $ (803,920)
Noncontrolling interest     $ 8,868        
Stock Repurchased During Period, Shares   (2,958,000)         (2,958,000)
Payments for Repurchase of Common Stock $ (101,768)           $ (101,768)
Exercise of stock options (in Shares)   273,000          
Exercise of stock options 6,212     6,212      
Issuance of fully vested restricted stock (in Shares)   490,000          
Stock-based compensation 23,170     23,170      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent           3,154  
Dividends, Common Stock, Cash (48,426)       (48,426)    
Unrealized holding gain on marketable securities net of taxes 88         88  
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (1,054)         (1,054)  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (1,444)   (1,444)        
Noncontrolling Interest, Increase from Business Combination 3,248   3,248        
Noncontrolling Interest, Increase from Acquisitions 1,909   1,909        
Net loss attributable to noncontrolling interests     411        
Foreign currency translation adjustment 2,885   (269)        
Net income         141,311    
Balance at Dec. 31, 2019 841,224            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common Stock, Shares, Outstanding   83,520,000          
Common Stock, Value, Issued   $ 6          
Additional paid-in capital       454,217      
Retained earnings         1,310,406    
Accumulated other comprehensive loss           (30,440)  
Treasury stock-shares at cost             49,234,000
Treasury Stock, Value             $ (905,688)
Noncontrolling interest     12,723        
Stock Repurchased During Period, Shares   (1,397,000)         (1,397,000)
Payments for Repurchase of Common Stock (46,583)           $ (46,583)
Exercise of stock options (in Shares)   80,000          
Exercise of stock options 1,609     1,607      
Issuance of fully vested restricted stock (in Shares)   413,000          
Stock-based compensation 22,639     22,639      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent           1,668  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest     883        
Dividends, Common Stock, Cash (12,459)       (12,459)    
Unrealized Gain (Loss) on Cash Flow Hedging Instruments (392)         (392)  
Noncontrolling Interest, Increase from Business Combination 359   359        
Net loss attributable to noncontrolling interests     116        
Foreign currency translation adjustment 2,551            
Net income         (18,397)    
Balance at Dec. 31, 2020 $ 790,369            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common Stock, Shares, Outstanding 82,616,000 82,616,000          
Common Stock, Value, Issued $ 8 $ 8          
Additional paid-in capital 478,463     478,463      
Retained earnings 1,279,550       1,279,550    
Accumulated other comprehensive loss $ (29,164)         (29,164)  
Treasury stock-shares at cost 50,631,000           50,631,000
Treasury Stock, Value $ (952,271)           $ (952,271)
Noncontrolling interest 13,783   13,783        
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value (298)   (298)        
Stock Repurchased During Period, Shares   (2,841,000)         (2,841,000)
Payments for Repurchase of Common Stock (123,161)           $ (123,161)
Exercise of stock options $ 9,732            
Exercise of stock options (in Shares) 411,000 411,000          
Exercise of stock options       9,732      
Issuance of fully vested restricted stock (in Shares)   371,000          
Stock-based compensation $ 22,278     22,278      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent           (1,456)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest     465        
Dividends, Common Stock, Cash (49,161)       (49,161)    
Unrealized Gain (Loss) on Cash Flow Hedging Instruments 1,076         1,076  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (3,121)   (3,121)        
Net loss attributable to noncontrolling interests     1,781        
Foreign currency translation adjustment (991)            
Net income         190,678    
Balance at Dec. 31, 2021 $ 820,538            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common Stock, Shares, Outstanding 80,557,000 80,557,000          
Common Stock, Value, Issued $ 8 $ 8          
Additional paid-in capital 495,999     495,999      
Retained earnings 1,421,067       $ 1,421,067    
Accumulated other comprehensive loss $ (29,544)         $ (29,544)  
Treasury stock-shares at cost 53,472,000           53,472,000
Treasury Stock, Value $ (1,075,432)           $ (1,075,432)
Noncontrolling interest 8,440   8,440        
Exercise of stock options   $ 0          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value $ (18,942)   $ (4,468) $ (14,474)