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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, 2016 $ 434,943 $ 448 $ 730,556 $ (3,006,771) $ 3,065,708 $ (354,998)
Beginning balance, shares at Dec. 31, 2016   26,020,234        
Exercise of stock options and restricted stock units, shares   270,413        
Exercise of stock options and restricted stock units, Value (28,649)     (38,586) (9,937)  
Repurchases of Common Stock, Shares   (749,254)        
Repurchases of Common Stock, Value (399,997)     (399,997)    
Tax benefit resulting from exercise of certain employee stock options 16,582   16,582      
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition 1,539   0      
Net earnings 375,972       375,972  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 89,592         89,592
Ending balance at Dec. 31, 2017 $ 547,280 $ 448 747,138 (3,368,182) 3,433,282 (265,406)
Ending 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 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