CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock and Additional Paid-In Capital	Retained Earnings	Cumulative Translation Adjustment	Retirement Benefits Adjustment	Cumulative Unrealized Gain (Loss) on Derivatives	Treasury Stock
Balance at Dec. 31, 2014	$ 1,486,451	$ 648,451	$ 1,483,821	$ (24,813)	$ (40,316)	$ (27,149)	$ (553,543)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65,954		65,954
Cumulative translation adjustment	(56,637)			(56,637)
Pension and other postretirement adjustments (net of tax of $395)	780				780
Amortization of forward starting swaps (net of tax of $642)	1,130					1,130
Issuance of 392,810 shares of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans	9,169	9,169
Excess tax benefit from share-based compensation	3,220	3,220
Repurchase of 829,744 shares of common stock	(62,132)						(62,132)
Shares surrendered for tax withholding	(3,107)						(3,107)
Share-based compensation	6,164	6,164
Balance at Mar. 31, 2015	$ 1,450,992	$ 667,004	$ 1,549,775	$ (81,450)	$ (39,536)	$ (26,019)	$ (618,782)