Consolidated Statement Of Total Equity (USD $) Share data in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interests [Member]	Total
Beginning Balance at Dec. 31, 2010	$ 455,000	$ 396,485,000	$ (53,660,000)	$ 1,082,160,000	$ 1,425,440,000	$ 42,819,000	$ 1,468,259,000
Beginning Balance, Shares at Dec. 31, 2010	45,579
Consolidated net earnings				67,541,000	67,541,000	949,000	68,490,000
Adjustment for funded status of pension and postretirement benefit plans, net of tax of $6,663			4,130,000		4,130,000	2,000	4,132,000
Foreign currency translation loss			(462,000)		(462,000)		(462,000)
Amortization of terminated value of forward starting interest rate swap agreements into interest expense, net of tax of $283			432,000		432,000		432,000
Consolidated comprehensive earnings					71,641,000	951,000	72,592,000
Dividends declared				(55,232,000)	(55,232,000)		(55,232,000)
Issuances of common stock for stock award plans	1,000	(1,210,000)			(1,209,000)		(1,209,000)
Issuances of common stock for stock award plans, shares	118
Stock-based compensation expense		9,317,000			9,317,000		9,317,000
Distributions to owners of noncontrolling interests						(1,000,000)	(1,000,000)
Purchase of remaining interest in existing limited liability company		(3,737,000)			(3,737,000)	(3,439,000)	(7,176,000)
Ending Balance at Sep. 30, 2011	$ 456,000	$ 400,855,000	$ (49,560,000)	$ 1,094,469,000	$ 1,446,220,000	$ 39,331,000	$ 1,485,551,000
Ending Balance, Shares at Sep. 30, 2011	45,697