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Consolidated Statements of Shareholders' Equity - USD ($)
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, 2014 $ 719,595,000 $ 448,000 $ 670,418,000 $ (2,095,656,000) $ 2,357,334,000 $ (212,949,000)
Beginning balance, shares at Dec. 31, 2014   28,243,007        
Exercise of stock options and restricted stock units, shares   403,908        
Exercise of stock options and restricted stock units, Value (29,556,000)     (47,393,000) (17,837,000)  
Repurchases of Common Stock, Shares   (1,556,797)        
Repurchases of Common Stock, Value (494,966,000)     (494,966,000)    
Tax benefit resulting from exercise of certain employee stock options 12,929,000   12,929,000      
Share-based compensation 14,223,000   14,223,000      
Net earnings 352,820,000       352,820,000  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (53,700,000)         (53,700,000)
Ending balance at Dec. 31, 2015 $ 580,457,000 $ 448,000 697,570,000 (2,543,229,000) 2,692,317,000 (266,649,000)
Ending balance, shares at Dec. 31, 2015   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 $ (25,471,000)     (36,450,000) (10,979,000)  
Repurchases of Common Stock, Shares (1,348,507) (1,348,507)        
Repurchases of Common Stock, Value $ (499,992,000)     (499,992,000)    
Tax benefit resulting from exercise of certain employee stock options 17,680,000   17,680,000      
Share-based compensation 15,306,000   15,306,000      
Net earnings 384,370,000       384,370,000  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (88,349,000)         (88,349,000)
Ending balance at Dec. 31, 2016 $ 434,943,000 $ 448,000 730,556,000 (3,006,771,000) 3,065,708,000 (354,998,000)
Ending balance, shares at Dec. 31, 2016 26,020,234 26,020,234        
Exercise of stock options and restricted stock units, shares 270,413 270,413        
Exercise of stock options and restricted stock units, Value $ (28,649,000)     (38,586,000) (9,937,000)  
Repurchases of Common Stock, Shares (749,254) (749,254)        
Repurchases of Common Stock, Value $ (399,997,000)     (399,997,000)    
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition 16,582,000 $ 0 16,582,000 0 0
Net earnings 375,972,000       375,972,000  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 89,592,000         89,592,000
Ending balance at Dec. 31, 2017 $ 547,280,000 $ 448,000 $ 747,138,000 $ (3,368,182,000) 3,433,282,000 $ (265,406,000)
Ending balance, shares at Dec. 31, 2017 25,541,393 25,541,393        
Cumulative Effect of New Accounting Principle in Period of Adoption $ 1,539,000       $ 1,539,000