Consolidated Statements Of Changes In Equity (USD $) In Thousands	Common Shares Issued At Par Value [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Comprehensive (Loss) Income [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interest [Member]	Total
Balance, beginning of period at Dec. 31, 2008	$ 72,426	$ 157,078	$ 935,460		$ (45,131)	$ (381,771)	$ 738,062	$ 7,759	$ 745,821
Net income			133,856	133,856			133,856	224	134,080
Cash dividends			(46,478)				(46,478)		(46,478)
Exercise of stock options, net of shares reacquired						2,447	2,447		2,447
Stock option amortization		4,350					4,350		4,350
Tax benefit - stock options and restricted stock		224					224		224
Restricted stock, net		(243)				3,283	3,040		3,040
Changes in pension and postretirement plan assets and benefit obligation, net of tax				(5,676)	(5,676)		(5,676)		(5,676)
Currency translation adjustment				55,937	55,937		55,937	(43)	55,894
Comprehensive income (loss)				184,117
Balance, end of period at Dec. 31, 2009	72,426	161,409	1,022,838		5,130	(376,041)	885,762	7,940	893,702
Net income			154,170	154,170			154,170	20	154,190
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		3,342				2,436	5,778		5,778
Changes in pension and postretirement plan assets and benefit obligation, net of tax				16,605	16,605		16,605		16,605
Currency translation adjustment				(10,217)	(10,217)		(10,217)	126	(10,091)
Comprehensive income (loss)				160,558
Balance, end of period at Dec. 31, 2010	72,426	174,143	1,126,630		11,518	(399,773)	984,944	8,086	993,030
Net income			26,315	26,315			26,315	201	26,516
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		2,155				2,959	5,114		5,114
Changes in pension and postretirement plan assets and benefit obligation, net of tax				(92,757)	(92,757)		(92,757)		(92,757)
Currency translation adjustment				(12,273)	(12,273)		(12,273)	216	(12,057)
Comprehensive income (loss)				(78,715)
Balance, end of period at Dec. 31, 2011	$ 72,426	$ 189,294	$ 1,095,953		$ (93,512)	$ (450,608)	$ 813,553	$ 8,503	$ 822,056