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Consolidated Statements of Stockholders' Investment - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance $ 1,652,561 $ 1,595,087 $ 1,484,672 $ 1,425,745 $ 1,595,087 $ 1,425,745  
Net income 169,180 161,788 159,163 142,297 330,968 301,460  
Cumulative effect change - revenue recognition             $ 9,239
Foreign currency translation (5,688) 5,297 (27,512) (565)      
Dividends declared (69,268) (69,683) (65,084) (65,384)      
Stock issued for employee benefit plans 7,699 7,573 10,547 6,406      
Issuance of restricted stock, net of forfeitures 0 0 0 0      
Stock-based compensation expense 14,684 17,123 26,570 18,134      
Repurchase of common stock (109,857) (64,624) (70,197) (51,200)      
Ending Balance $ 1,659,311 $ 1,652,561 $ 1,518,159 $ 1,484,672 $ 1,659,311 $ 1,518,159  
Common Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance (in shares) 136,889 137,284 139,353 139,542 137,284 139,542  
Beginning Balance $ 13,689 $ 13,728 $ 13,935 $ 13,954 $ 13,728 $ 13,954  
Stock issued for employee benefit plans (in shares) 129 342 174 370      
Stock issued for employee benefit plans $ 13 $ 34 $ 17 $ 37      
Issuance of restricted stock, net of forfeitures (in shares) 23   1        
Issuance of restricted stock, net of forfeitures (in shares)   (3)   (2)      
Issuance of restricted stock, net of forfeitures $ 2 $ 0 $ 0 $ 0      
Stock-based compensation expense (in shares) 0 0 0 0      
Stock-based compensation expense $ 0 $ 0 $ 0 $ 0      
Repurchase of common stock (in shares) (1,310) (734) (784) (557)      
Repurchase of common stock $ (131) $ (73) $ (78) $ (56)      
Ending Balance (in shares) 135,731 136,889 138,744 139,353 135,731 138,744  
Ending Balance $ 13,573 $ 13,689 $ 13,874 $ 13,935 $ 13,573 $ 13,874  
Additional Paid-in Capital              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance 527,089 521,486 451,966 444,280 521,486 444,280  
Stock issued for employee benefit plans (681) (11,520) (85) (10,441)      
Issuance of restricted stock, net of forfeitures (2) 0 0 0      
Stock-based compensation expense 14,684 17,123 26,570 18,127      
Ending Balance 541,090 527,089 478,451 451,966 541,090 478,451  
Retained Earnings              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance 3,937,698 3,845,593 3,523,245 3,437,093 3,845,593 3,437,093  
Net income 169,180 161,788 159,163 142,297      
Cumulative effect change - revenue recognition             $ 9,239
Dividends declared (69,268) (69,683) (65,084) (65,384)      
Ending Balance 4,037,610 3,937,698 3,617,324 3,523,245 4,037,610 3,617,324  
Accumulated Other Comprehensive Income (Loss)              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance (66,638) (71,935) (19,025) (18,460) (71,935) (18,460)  
Foreign currency translation (5,688) 5,297 (27,512) (565)      
Ending Balance (72,326) (66,638) (46,537) (19,025) (72,326) (46,537)  
Treasury Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance (2,759,277) (2,713,785) (2,485,449) (2,451,122) (2,713,785) (2,451,122)  
Stock issued for employee benefit plans 8,367 19,059 10,615 16,810      
Stock-based compensation expense 0 0 0 7      
Repurchase of common stock (109,726) (64,551) (70,119) (51,144)      
Ending Balance $ (2,860,636) $ (2,759,277) $ (2,544,953) $ (2,485,449) $ (2,860,636) $ (2,544,953)