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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, 2012 $ 827,219 $ 448 $ 638,705 $ (1,463,924) $ 1,749,451 $ (97,461)
Beginning balance, shares at Dec. 31, 2012   30,410,006        
Exercise of stock options and restricted stock units, shares   398,646        
Exercise of stock options and restricted stock units, Value (19,745)     (37,870) (18,125)  
Repurchases of Common Stock, Shares   (1,321,577)        
Repurchases of Common Stock, Value (294,976)     (294,976)    
Tax benefit resulting from exercise of certain employee stock options 1,906   1,906      
Share-based compensation 12,639   12,639      
Net earnings 306,094       306,094  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 62,425         62,425
Ending balance at Dec. 31, 2013 935,052 $ 448 653,250 (1,721,030) 2,037,420 (35,036)
Ending 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) (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 28,243,007        
Exercise of stock options and restricted stock units, shares   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