CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands	Total	Common Shares Issued At Par Value [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interest [Member]
Balance, beginning of period at Dec. 31, 2009	$ 893,702	$ 72,426	$ 161,409	$ 1,022,838	$ 5,130	$ (376,041)	$ 885,762	$ 7,940
Net income	154,190			154,170			154,170	20
Cash dividends	(50,378)			(50,378)			(50,378)
Reacquisition on open market	(49,988)					(49,988)	(49,988)
Exercise of stock options, net of shares reacquired	23,820					23,820	23,820
Stock option amortization	6,102		6,102				6,102
Tax benefit — stock options and restricted stock	3,290		3,290				3,290
Restricted stock, net	5,778		3,342			2,436	5,778
Changes in pension and postretirement plan assets and benefit obligation, net of tax	16,605				16,605		16,605
Currency translation adjustment	(10,091)				(10,217)		(10,217)	126
Balance, end of period at Dec. 31, 2010	993,030	72,426	174,143	1,126,630	11,518	(399,773)	984,944	8,086
Net income	26,516			26,315			26,315	201
Cash dividends	(56,992)			(56,992)			(56,992)
Reacquisition on open market	(79,999)					(79,999)	(79,999)
Exercise of stock options, net of shares reacquired	26,205					26,205	26,205
Stock option amortization	6,899		6,899				6,899
Tax benefit — stock options and restricted stock	6,097		6,097				6,097
Restricted stock, net	5,114		2,155			2,959	5,114
Changes in pension and postretirement plan assets and benefit obligation, net of tax	(92,757)				(92,757)		(92,757)
Currency translation adjustment	(12,057)				(12,273)		(12,273)	216
Balance, end of period at Dec. 31, 2011	822,056	72,426	189,294	1,095,953	(93,512)	(450,608)	813,553	8,503
Net income	217,821			216,993			216,993	828
Cash dividends	(61,974)			(61,974)			(61,974)
Reacquisition on open market	(49,991)					(49,991)	(49,991)
Exercise of stock options, net of shares reacquired	16,566					16,566	16,566
Stock option amortization	8,571		8,571				8,571
Tax benefit — stock options and restricted stock	3,603		3,603				3,603
Restricted stock, net	5,627		3,004			2,623	5,627
Changes in pension and postretirement plan assets and benefit obligation, net of tax	(39,384)				(39,384)		(39,384)	338
Currency translation adjustment	4,481				4,819		4,819
Balance, end of period at Dec. 31, 2012	$ 927,376	$ 72,426	$ 204,472	$ 1,250,972	$ (128,077)	$ (481,410)	$ 918,383	$ 8,993