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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' INVESTMENT - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance   $ 1,150,450   $ 1,047,015 $ 1,150,450 $ 1,047,015 $ 939,724
Net income $ 122,303 $ 118,963 $ 126,583 $ 106,476 513,384 509,699 449,711
Foreign currency translation adjustment         (23,496) (9,336) (17,990)
Dividends declared, $1.57 in 2015, $1.43 in 2014 and $1.40 in 2013 per share         (245,426) (235,618) (215,005)
Stock issued for employee benefit plans         $ (17,405) 4,188 (667)
Issuance of restricted stock (in shares)         1,797,991    
Issuance of restricted stock         $ 0 0 0
Stock-based compensation expense         38,554 58,067 47,721
Excess tax benefit on deferred compensation and employee stock plans         18,462 8,548 7,558
Repurchase of common stock         (176,676) (232,113) (164,037)
Ending Balance $ 1,257,847   $ 1,150,450   $ 1,257,847 $ 1,150,450 $ 1,047,015
Common Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance (in shares)   143,455,000   146,458,000 143,455,000 146,458,000 150,197,000
Beginning Balance   $ 14,345   $ 14,646 $ 14,345 $ 14,646 $ 15,020
Stock issued for employee benefit plans (in shares)         32,000 254,000 405,000
Stock issued for employee benefit plans         $ 3 $ 25 $ 40
Issuance of restricted stock (in shares)         221,000 164,000 (410,000)
Issuance of restricted stock         $ 22 $ 16 $ (41)
Stock-based compensation expense (in shares)         17,000   30,000
Stock-based compensation expense         $ 3   $ 3
Repurchase of common stock (in shares)         (2,467,000) (3,421,000) (3,764,000)
Repurchase of common stock         $ (247) $ (342) $ (376)
Ending Balance (in shares) 141,258,000   143,455,000   141,258,000 143,455,000 146,458,000
Ending Balance $ 14,126   $ 14,345   $ 14,126 $ 14,345 $ 14,646
Additional Paid-in Capital              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance   379,444   321,968 379,444 321,968 217,894
Stock issued for employee benefit plans         (16,121) (9,095) (24,644)
Issuance of restricted stock         (22) (16) 41
Stock-based compensation expense         37,517 58,039 46,119
Excess tax benefit on deferred compensation and employee stock plans         18,462 8,548 7,558
Repurchase of common stock             75,000
Ending Balance 419,280   379,444   419,280 379,444 321,968
Retained Earnings              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance   2,922,620   2,648,539 2,922,620 2,648,539 2,413,833
Net income         513,384 509,699 449,711
Dividends declared, $1.57 in 2015, $1.43 in 2014 and $1.40 in 2013 per share         (245,426) (235,618) (215,005)
Ending Balance 3,190,578   2,922,620   3,190,578 2,922,620 2,648,539
Accumulated Other Comprehensive Loss              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance   (37,946)   (28,610) (37,946) (28,610) (10,620)
Foreign currency translation adjustment         (23,496) (9,336) (17,990)
Ending Balance (61,442)   (37,946)   (61,442) (37,946) (28,610)
Treasury Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning Balance   $ (2,128,013)   $ (1,909,528) (2,128,013) (1,909,528) (1,696,403)
Stock issued for employee benefit plans         (1,287) 13,258 23,937
Stock-based compensation expense         1,034 28 1,599
Repurchase of common stock         (176,429) (231,771) (238,661)
Ending Balance $ (2,304,695)   $ (2,128,013)   $ (2,304,695) $ (2,128,013) $ (1,909,528)