CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands	Total	Common Stock and Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Earnings (Loss)
Balance (in shares) at beginning of period at Dec. 31, 2012		145,814
Balance at beginning of period at Dec. 31, 2012	$ 1,599,901,000	$ 171,546,000	$ 1,418,814,000	$ 9,541,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings for the year	177,015,000		177,015,000
Income tax benefit of common stock options exercised	551,000	$ 551,000
Repurchase of common stock (in shares)		(5,988)
Repurchase of common stock	(162,078,000)	$ (162,078,000)
Common stock issued pursuant to stock-based compensation plans, net (in shares)		956
Common stock issued pursuant to stock-based compensation plans, net	4,849,000	$ 4,849,000
Stock-based compensation expense	28,087,000	$ 28,087,000
Dividends paid	(51,404,000)		(51,404,000)
Other comprehensive income (loss)	16,459,000			16,459,000
Balance (in shares) at end of period at Dec. 31, 2013		140,782
Balance at end of period at Dec. 31, 2013	1,613,380,000	$ 42,955,000	1,544,425,000	26,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings for the year	200,261,000		200,261,000
Income tax benefit of common stock options exercised	12,751,000	$ 12,751,000
Repurchase of common stock (in shares)		(4,243)
Repurchase of common stock	(139,238,000.000)	$ (122,851,000)	(16,387,000)
Common stock issued pursuant to stock-based compensation plans, net (in shares)		3,040
Common stock issued pursuant to stock-based compensation plans, net	37,774,000	$ 37,774,000
Stock-based compensation expense	30,767,000	$ 30,767,000
Dividends paid	(56,513,000)		(56,513,000)
Other comprehensive income (loss)	(89,409,000)			(89,409,000)
Balance (in shares) at end of period at Dec. 31, 2014		139,579
Balance at end of period at Dec. 31, 2014	1,609,773,000	$ 1,396,000	1,671,786,000	(63,409,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings for the year	241,686,000		241,686,000
Income tax benefit of common stock options exercised	1,611,000	$ 1,611,000
Repurchase of common stock (in shares)		(4,169)
Repurchase of common stock	(123,193,000)	$ (44,387,000)	(78,806,000)
Common stock issued pursuant to stock-based compensation plans, net (in shares)		1,940
Common stock issued pursuant to stock-based compensation plans, net	17,071,000	$ 17,071,000
Stock-based compensation expense	25,683,000	$ 25,683,000
Dividends paid	(61,399,000)		(61,399,000)
Other comprehensive income (loss)	(61,717,000)			(61,717,000)
Balance (in shares) at end of period at Dec. 31, 2015		137,350
Balance at end of period at Dec. 31, 2015	$ 1,649,515,000	$ 1,374,000	$ 1,773,267,000	$ (125,126,000)