Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Capital Units	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Parent	Noncontrolling Interest
Balance at beginning of year at Dec. 31, 2009		$ 586	$ 558,733	$ 543,272	$ 82,514	$ (132,935)		$ 11,839
Balance at beginning of year,shares at Dec. 31, 2009		58,631
Stock issued for benefit and stock compensation plans		819
Stock issued for benefit and stock compensation plans		9	23,485
Net income attributable to noncontrolling interests	1,992							1,992
Net income	174,954			172,962
Purchases of treasury stock						(49,261)
Dividends to minority stockholders								(997)
Stock-based compensation			9,770
Cash dividends declared; $0.20 per common share in 2012, 2011, and 2010, respectively				(10,535)
Deferred compensation						(348)
Foreign currency translation adjustments, net					(65,291)			(324)
Unrecognized gain (loss) on cash flow hedges, net of tax	(683)				(683)
Foreign currency (loss) gain on investment in foreign subsidiaries	40,414				40,414
Pension and other postretirement prior service cost and actuarial gain or loss, net of tax	4,471				4,471
Balance at end of year at Dec. 31, 2010	1,189,673	595	591,988	705,699	61,425	(182,544)	1,177,163	12,510
Balance at end of year,shares at Dec. 31, 2010		59,450
Stock issued for benefit and stock compensation plans		323
Stock issued for benefit and stock compensation plans		3	8,649
Net income attributable to noncontrolling interests	1,979							1,979
Net income	279,542			277,563
Purchases of treasury stock						(132,498)
Dividends to minority stockholders								(1,024)
Stock-based compensation			9,970
Cash dividends declared; $0.20 per common share in 2012, 2011, and 2010, respectively				(10,395)
Deferred compensation						(272)
Acquisition of noncontrolling interests			(8,753)					(11,534)
Business combinations								95
Foreign currency translation adjustments, net					(31,249)			314
Unrecognized gain (loss) on cash flow hedges, net of tax	434				434
Foreign currency (loss) gain on investment in foreign subsidiaries	(1,783)				(1,783)
Pension and other postretirement prior service cost and actuarial gain or loss, net of tax	(11,541)				(11,541)
Balance at end of year at Dec. 31, 2011	1,279,631	598	601,854	972,867	17,286	(315,314)	1,277,291	2,340
Balance at end of year,shares at Dec. 31, 2011		59,773
Stock issued for benefit and stock compensation plans		304
Stock issued for benefit and stock compensation plans		3	8,029
Net income attributable to noncontrolling interests	1,227							1,227
Net income	264,493			263,266
Purchases of treasury stock						(115,516)
Dividends to minority stockholders								(1,089)
Stock-based compensation			8,571
Cash dividends declared; $0.20 per common share in 2012, 2011, and 2010, respectively				(9,896)
Deferred compensation						(23)
Foreign currency translation adjustments, net					20,341			70
Unrecognized gain (loss) on cash flow hedges, net of tax	185				185
Foreign currency (loss) gain on investment in foreign subsidiaries	4,850				4,850
Pension and other postretirement prior service cost and actuarial gain or loss, net of tax	(5,486)				(5,486)
Balance at end of year at Dec. 31, 2012	$ 1,454,163	$ 601	$ 618,454	$ 1,226,237	$ 37,176	$ (430,853)	$ 1,451,615	$ 2,548
Balance at end of year,shares at Dec. 31, 2012		60,077