CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock and Additional Paid-In Capital	Retained Earnings	Cumulative Translation Adjustment	Retirement Benefits Adjustments	Cumulative Unrealized Loss on Derivatives	Treasury Stock
Balance at Dec. 31, 2012	$ 1,464,998	$ 551,559	$ 1,113,541	$ 38,639	$ (45,645)	$ (36,397)	$ (156,699)
Net income	61,300		61,300
Cumulative translation adjustment	(27,253)			(27,253)
Pension and other postretirement adjustments, net of tax	1,273				1,273
Amortization of forward starting swaps, net of tax	1,190					1,190
Issuance of 616,273 shares of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans, net of tax benefit	13,022	13,022
Repurchase of 706,491 shares of common stock	(35,653)						(35,653)
Unvested shares surrendered for tax withholding	(1,735)						(1,735)
Share-based compensation	4,505	4,505
Balance at Mar. 31, 2013	$ 1,481,647	$ 569,086	$ 1,174,841	$ 11,386	$ (44,372)	$ (35,207)	$ (194,087)