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Interim Consolidated Statements of Shareholders' Equity and Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2019 $ 420,780 $ 448 $ 783,871 $ (4,539,154) $ 4,499,288 $ (323,673)
Beginning balance, shares at Dec. 31, 2019   24,125,317        
Stock Issued During Period, Value, Treasury Stock Reissued (7,135)   0 (9,355) (2,220)  
Exercise of stock options and restricted stock units, shares   50,372        
Treasury Stock, Value, Acquired, Cost Method (200,000)     (200,000)    
Repurchases of common stock, shares   (268,161)        
Adjustment to Additional Paid in Capital, Share-Based Compensation 4,395   4,395      
Net earnings 98,115       98,115  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (24,028)         (24,028)
Ending balance at Mar. 31, 2020 306,397 $ 448 788,266 (4,729,799) 4,595,183 (347,701)
Ending balance, shares at Mar. 31, 2020   23,907,528        
Beginning balance at Dec. 31, 2019 $ 420,780 $ 448 783,871 (4,539,154) 4,499,288 (323,673)
Beginning balance, shares at Dec. 31, 2019   24,125,317        
Exercise of stock options and restricted stock units, shares 144,776          
Treasury Stock, Value, Acquired, Cost Method $ (400,000)          
Repurchases of common stock, shares (475,530)          
Net earnings $ 386,444          
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (3,600)          
Ending balance at Sep. 30, 2020 443,067 $ 448 799,701 (4,912,096) 4,882,287 (327,273)
Ending balance, shares at Sep. 30, 2020   23,794,563        
Beginning balance at Mar. 31, 2020 306,397 $ 448 788,266 (4,729,799) 4,595,183 (347,701)
Beginning balance, shares at Mar. 31, 2020   23,907,528        
Stock Issued During Period, Value, Treasury Stock Reissued (10,615)   0 (11,837) (1,222)  
Exercise of stock options and restricted stock units, shares   63,737        
Treasury Stock, Value, Acquired, Cost Method 0     0    
Repurchases of common stock, shares   0        
Adjustment to Additional Paid in Capital, Share-Based Compensation 4,423   4,423      
Net earnings 126,562       126,562  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 2,096         2,096
Ending balance at Jun. 30, 2020 450,093 $ 448 792,689 (4,717,962) 4,720,523 (345,605)
Ending balance, shares at Jun. 30, 2020   23,971,265        
Stock Issued During Period, Value, Treasury Stock Reissued (8,444)   (2,582) (5,865) (3)  
Exercise of stock options and restricted stock units, shares   30,667        
Treasury Stock, Value, Acquired, Cost Method (199,999)     (199,999)    
Repurchases of common stock, shares   (207,369)        
Adjustment to Additional Paid in Capital, Share-Based Compensation 4,430   4,430      
Net earnings 161,767       161,767  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 18,332         18,332
Ending balance at Sep. 30, 2020 443,067 $ 448 799,701 (4,912,096) 4,882,287 (327,273)
Ending balance, shares at Sep. 30, 2020   23,794,563        
Beginning balance at Dec. 31, 2020 $ 282,675 $ 448 805,140 (5,283,584) 5,095,596 (334,925)
Beginning balance, shares at Dec. 31, 2020 24,125,317 23,471,841        
Stock Issued During Period, Value, Treasury Stock Reissued $ (5,049)   (1,239) (4,682) (872)  
Exercise of stock options and restricted stock units, shares   22,388        
Treasury Stock, Value, Acquired, Cost Method (262,500)     (262,500)    
Repurchases of common stock, shares   (224,808)        
Adjustment to Additional Paid in Capital, Share-Based Compensation 4,575   4,575      
Net earnings 149,663       149,663  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 23,181         23,181
Ending balance at Mar. 31, 2021 202,643 $ 448 810,954 (5,541,402) 5,244,387 (311,744)
Ending balance, shares at Mar. 31, 2021   23,269,421        
Beginning balance at Dec. 31, 2020 $ 282,675 $ 448 805,140 (5,283,584) 5,095,596 (334,925)
Beginning balance, shares at Dec. 31, 2020 24,125,317 23,471,841        
Exercise of stock options and restricted stock units, shares 71,124          
Treasury Stock, Value, Acquired, Cost Method $ (727,500)          
Repurchases of common stock, shares (557,310)          
Net earnings $ 538,114          
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 37,073          
Ending balance at Sep. 30, 2021 $ 159,171 $ 448 820,272 (5,995,662) 5,631,965 (297,852)
Ending balance, shares at Sep. 30, 2021 23,794,563 22,985,655        
Beginning balance at Mar. 31, 2021 $ 202,643 $ 448 810,954 (5,541,402) 5,244,387 (311,744)
Beginning balance, shares at Mar. 31, 2021   23,269,421        
Stock Issued During Period, Value, Treasury Stock Reissued (2,784)   0 (2,849) (65)  
Exercise of stock options and restricted stock units, shares   13,248        
Treasury Stock, Value, Acquired, Cost Method (212,499)     (212,499)    
Repurchases of common stock, shares   (165,730)        
Adjustment to Additional Paid in Capital, Share-Based Compensation 4,581   4,581      
Net earnings 184,763       184,763  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 9,152         9,152
Ending balance at Jun. 30, 2021 191,424 $ 448 815,535 (5,751,052) 5,429,085 (302,592)
Ending balance, shares at Jun. 30, 2021   23,116,939        
Stock Issued During Period, Value, Treasury Stock Reissued (7,081)   0 (7,889) (808)  
Exercise of stock options and restricted stock units, shares   35,488        
Treasury Stock, Value, Acquired, Cost Method (252,499)     (252,499)    
Repurchases of common stock, shares   (166,772)        
Adjustment to Additional Paid in Capital, Share-Based Compensation 4,737   4,737      
Net earnings 203,688       203,688  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 4,740         4,740
Ending balance at Sep. 30, 2021 $ 159,171 $ 448 $ 820,272 $ (5,995,662) $ 5,631,965 $ (297,852)
Ending balance, shares at Sep. 30, 2021 23,794,563 22,985,655