CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock Including Additional Paid in Capital	Retained Earnings	Cumulative Foreign Currency Translation Adjustments	Retirement Benefits Adjustments	Unrealized Gain Loss On Derivatives	Treasury Stock
Balance at Dec. 31, 2009	$ 1,268,104	$ 402,405	$ 896,977	$ 59,399	$ (27,258)	$ (6,713)	$ (56,706)
Net income	157,100		157,100
Cumulative translation adjustment	(21,097)			(21,097)
Net change in retirement obligations, net of tax	(2,830)				(2,830)
Net change on derivatives designated as cash flow hedges, net of tax	(14,210)					(14,210)
Issuance of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans	22,354	22,354
Share-based compensation	17,358	17,358
Unvested shares surrendered for tax withholding	(2,082)						(2,082)
Cash dividends declared	(49,037)		(49,037)
Balance at Dec. 31, 2010	1,375,660	442,117	1,005,040	38,302	(30,088)	(20,923)	(58,788)
Net income	193,857		193,857
Cumulative translation adjustment	(14,108)			(14,108)
Net change in retirement obligations, net of tax	(8,398)				(8,398)
Net change on derivatives designated as cash flow hedges, net of tax	(20,254)					(20,254)
Issuance of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans	37,621	37,621
Share-based compensation	11,250	11,250
Unvested shares surrendered for tax withholding	(6,008)						(6,008)
Cash dividends declared	(56,485)		(56,485)
Balance at Dec. 31, 2011	1,513,135	490,988	1,142,412	24,194	(38,486)	(41,177)	(64,796)
Net income	37,630		37,630
Cumulative translation adjustment	14,445			14,445
Net change in retirement obligations, net of tax	(7,159)				(7,159)
Net change on derivatives designated as cash flow hedges, net of tax	4,780					4,780
Issuance of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans	49,721	49,721
Repurchase of 2,182,946 shares of common stock	(89,563)						(89,563)
Share-based compensation	10,850	10,850
Unvested shares surrendered for tax withholding	(2,340)						(2,340)
Cash dividends declared	(66,501)		(66,501)
Balance at Dec. 31, 2012	$ 1,464,998	$ 551,559	$ 1,113,541	$ 38,639	$ (45,645)	$ (36,397)	$ (156,699)