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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, 2013 $ 935,052 $ 448 $ 653,250 $ (1,721,030) $ 2,037,420 $ (35,036)
Beginning balance, shares at Dec. 31, 2013   29,487,075        
Exercise of stock options and restricted stock units, shares   373,431        
Exercise of stock options and restricted stock units, Value (21,047)     (39,374) (18,327)  
Repurchases of Common Stock, Shares   (1,617,499)        
Repurchases of Common Stock, Value (414,000)     (414,000)    
Tax benefit resulting from exercise of certain employee stock options 3,557   3,557      
Share-based compensation 13,611   13,611      
Net earnings 338,241       338,241  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (177,913)         (177,913)
Ending balance at Dec. 31, 2014 $ 719,595 $ 448 670,418 (2,095,656) 2,357,334 (212,949)
Ending balance, shares at Dec. 31, 2014   28,243,007        
Exercise of stock options and restricted stock units, shares 403,908 403,908        
Exercise of stock options and restricted stock units, Value $ (29,556)     (47,393) (17,837)  
Repurchases of Common Stock, Shares (1,556,797) (1,556,797)        
Repurchases of Common Stock, Value $ (494,966)     (494,966)    
Tax benefit resulting from exercise of certain employee stock options 12,929   12,929      
Share-based compensation 14,223   14,223      
Net earnings 352,820       352,820  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (53,700)         (53,700)
Ending balance at Dec. 31, 2015 $ 580,457 $ 448 697,570 (2,543,229) 2,692,317 (266,649)
Ending balance, shares at Dec. 31, 2015 27,090,118 27,090,118        
Exercise of stock options and restricted stock units, shares 278,623 278,623        
Exercise of stock options and restricted stock units, Value $ (25,471)     (36,450) (10,979)  
Repurchases of Common Stock, Shares (1,348,507) (1,348,507)        
Repurchases of Common Stock, Value $ (499,992)     (499,992)    
Tax benefit resulting from exercise of certain employee stock options 17,680   17,680      
Share-based compensation 15,306   15,306      
Net earnings 384,370       384,370  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (88,349)         (88,349)
Ending balance at Dec. 31, 2016 $ 434,943 $ 448 $ 730,556 $ (3,006,771) $ 3,065,708 $ (354,998)
Ending balance, shares at Dec. 31, 2016 26,020,234 26,020,234