Condensed Consolidated Statements Of Shareholders' Equity (USD $) In Thousands	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, 2010	$ 442,117	$ 1,005,040	$ 38,302	$ (30,088)	$ (20,923)	$ (58,788)	$ 1,375,660
Net income		146,469					146,469
Other comprehensive income, net of tax:
Cumulative translation adjustment			5,100				5,100
Amortization of retirement obligations				2,354			2,354
Net change on derivatives designated as cash flow hedges					(20,398)		(20,398)
Other comprehensive income							(12,944)
Comprehensive income							133,525
Issuance of 1,500,599 shares of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans, net of tax benefit	35,217						35,217
Unvested shares surrendered for tax withholding						(5,838)	(5,838)
Share-based compensation	9,198						9,198
Cash dividends declared - $.51 per common share		(42,341)					(42,341)
Balance at Sep. 30, 2011	$ 486,532	$ 1,109,168	$ 43,402	$ (27,734)	$ (41,321)	$ (64,626)	$ 1,505,421