Consolidated Statement of Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Capital in Excess of Par Value [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance at beginning of period at Dec. 31, 2008	$ 1,293,179	$ 249,953	$ (481)	$ 1,733,814	$ (726,756)	$ 36,649	$ 0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income	123,093				123,098		(5)
Foreign currency translation	60,523					60,493	30
Total comprehensive income	183,616
Tax benefits related to share based awards	19,059			19,059
Dividends declared on common stock	(40,381)			(40,381)
Stock option exercises	17,407	3,643		13,764
Restricted stock awards, net of forfeitures	0	830		(830)
Employee share-based compensation earned	9,684			9,684
Issuance of shares from treasury stock	455	1	71	383
Noncontrolling interest payment	(231)						(231)
Retirement of treasury shares	0	(400)	400
Other	0				(218)		218
Balance at end of period at Dec. 31, 2009	1,482,788	254,027	(10)	1,735,493	(603,876)	97,142	12
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income	127,001				126,417		584
Foreign currency translation	15,635					15,626	9
Total comprehensive income	142,636
Tax benefits related to share based awards	(229)			(229)
Dividends declared on common stock	(39,442)			(39,442)
Stock option exercises	1,759	431		1,328
Restricted stock awards, net of forfeitures	0	532		(532)
Employee share-based compensation earned	8,878			8,878
Purchase of Company common stock	(116,878)		(14,008)	(102,870)
Noncontrolling interest payment	(113)						(113)
Retirement of treasury shares	0	(12,973)	12,973
Other	549	3	60	486
Balance at end of period at Dec. 31, 2010	1,479,948	242,020	(985)	1,603,112	(477,459)	112,768	492
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income	146,232				144,903		1,329
Foreign currency translation	(6,925)					(6,916)	(9)
Total comprehensive income	139,307
Dividends declared on common stock	(46,171)			(46,171)
Stock option exercises	8,227	1,208		7,019
Restricted stock awards, net of forfeitures	0	539		(539)
Employee share-based compensation earned	9,144			9,144
Purchase of Company common stock	(197,302)		(19,899)	(142,915)	34,488
Acquisition	18,857						18,857
Noncontrolling interest payment	(568)						(568)
Retirement of treasury shares	0	(19,174)	19,174
Other	753	73		680
Balance at end of period at Dec. 31, 2011	$ 1,412,195	$ 224,666	$ (1,710)	$ 1,430,330	$ (367,044)	$ 105,852	$ 20,101