Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock And Additional Paid-In Capital [Member]	Retained Earnings [Member]	Cumulative Translation Adjustment [Member]	Retirement Benefits Adjustments [Member]	Cumulative Unrealized Loss On Derivatives [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2008	$ 377,982	$ 822,286	$ 40,204	$ (33,654)	$ (6,642)	$ (55,393)	$ 1,144,783
Net income		113,391					113,391
Other comprehensive income, net of tax:
Cumulative translation adjustment			19,195				19,195
Net change in retirement obligations, net of tax				6,396			6,396
Net change on derivatives designated as cash flow hedges, net of tax					(71)		(71)
Other comprehensive income (loss)							25,520
Comprehensive income							138,911
Issuance of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans	8,713						8,713
Share-based compensation	15,710						15,710
Unvested shares surrendered for tax withholding						(1,313)	(1,313)
Cash dividends declared		(38,700)					(38,700)
Balance at Dec. 31, 2009	402,405	896,977	59,399	(27,258)	(6,713)	(56,706)	1,268,104
Net income		157,100					157,100
Other comprehensive income, net of tax:
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)
Other comprehensive income (loss)							(38,137)
Comprehensive income							118,963
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	442,117	1,005,040	38,302	(30,088)	(20,923)	(58,788)	1,375,660
Net income		193,857					193,857
Other comprehensive income, net of tax:
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)
Other comprehensive income (loss)							(42,760)
Comprehensive income							151,097
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	$ 490,988	$ 1,142,412	$ 24,194	$ (38,486)	$ (41,177)	$ (64,796)	$ 1,513,135