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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2017 $ 547,280 $ 448 $ 747,138 $ (3,368,182) $ 3,433,282 $ (265,406)
Beginning balance, shares at Dec. 31, 2017   25,541,393        
Exercise of stock options and restricted stock units, shares 183,379 183,379        
Exercise of stock options and restricted stock units, Value $ (24,600)     (28,577) (3,977)  
Repurchases of Common Stock, Shares (802,809) (802,809)        
Repurchases of Common Stock, Value $ (474,999)     (474,999)    
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition 17,579   17,579      
Net earnings 512,611       512,611  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (37,008)         (37,008)
Ending balance at Dec. 31, 2018 $ 590,063 $ 448 764,717 (3,814,604) 3,941,916 (302,414)
Ending balance, shares at Dec. 31, 2018   24,921,963        
Exercise of stock options and restricted stock units, shares 298,002 298,002        
Exercise of stock options and restricted stock units, Value $ (47,581)     (50,449) (3,737)  
Repurchases of Common Stock, Shares (1,094,648) (1,094,648)        
Repurchases of Common Stock, Value $ (774,999)     (774,999)    
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition 18,285   18,285      
Net earnings 561,109       561,109  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (21,259)         (21,259)
Ending balance at Dec. 31, 2019 $ 420,780 $ 448 783,871 (4,539,154) 4,499,288 (323,673)
Ending balance, shares at Dec. 31, 2019 24,125,317 24,125,317        
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition     869      
Exercise of stock options and restricted stock units, shares 162,176 162,176        
Exercise of stock options and restricted stock units, Value $ (26,719)     (30,568) (6,431)  
Repurchases of Common Stock, Shares (815,652) (815,652)        
Repurchases of Common Stock, Value $ (774,998)     (774,998)    
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition 18,687   18,687      
Net earnings 602,739       602,739  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (11,252)         (11,252)
Ending balance at Dec. 31, 2020 $ 282,675 $ 448 805,140 $ (5,283,584) $ 5,095,596 $ (334,925)
Ending balance, shares at Dec. 31, 2020 23,471,841 23,471,841        
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition     $ 2,582