Unaudited Condensed Consolidated Statement of Equity Statement (USD $) In Thousands	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, 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	90,232	0	0	0	89,962	0	270
Dividends declared on common stock	(29,830)	0	0	(29,830)	0	0	0
Foreign currency translation	4,763	0	0	0	0	4,761	2
Employee share-based compensation earned	6,714	0	0	6,714	0	0	0
Stock option exercises	1,469	389	0	1,080	0	0	0
Tax benefits related to share based awards	868	0	0	868	0	0	0
Restricted stock awards, net of forfeitures	0	532	0	(532)	0	0	0
Purchase of Company common stock	(86,871)	0	(10,358)	(76,513)	0	0	0
Other	611	3	60	548	0	0	0
Balance at end of period at Sep. 30, 2010	1,470,744	254,951	(10,308)	1,637,828	(513,914)	101,903	284
Balance at beginning 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	101,682				100,353		1,329
Dividends declared on common stock	(35,140)			(35,140)
Foreign currency translation	(13,229)					(13,216)	(13)
Employee share-based compensation earned	6,843			6,843
Stock option exercises	7,694	1,137		6,557
Restricted stock awards, net of forfeitures	0	539		(539)
Purchase of Company common stock	(146,590)		(14,785)	(109,914)	(21,891)
Acquisition	18,857						18,857
Noncontrolling interest payment	(568)						(568)
Other	752	72		680
Balance at end of period at Sep. 30, 2011	$ 1,420,249	$ 243,768	$ (15,770)	$ 1,471,599	$ (398,997)	$ 99,552	$ 20,097