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 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	187,660		187,660
Cumulative translation adjustment	5,726			5,726
Pension and other postretirement adjustments (net of tax of $1,877)	2,907				2,907
Amortization of forward starting swaps (net of tax of $2,036)	3,551					3,551
Issuance of 1,318,268 shares of common stock from issuance of unvested shares, exercise of stock options and deferred compensation plans (net of tax of $4,024)	37,240	37,240
Repurchase of 2,510,306 shares of common stock	(139,994)						(139,994)
Unvested shares surrendered for tax withholding	(1,781)						(1,781)
Share-based compensation	10,614	10,614
Cash dividends declared - $.69 per common share	(56,397)		(56,397)
Balance at Sep. 30, 2013	$ 1,514,524	$ 599,413	$ 1,244,804	$ 44,365	$ (42,738)	$ (32,846)	$ (298,474)