Unaudited Condensed Consolidated Statement of Equity Statement (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, 2010	$ 1,479,948	$ 242,020	$ (985)	$ 1,603,112	$ (477,459)	$ 112,768	$ 492
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	88,453	0	0	0	100,353	(13,216)	1,316
Net Income (Loss) Attributable to Parent	100,353
Dividends declared on common stock	(35,140)	0	0	(35,140)	0	0	0
Employee share-based compensation earned	6,843	0	0	6,843	0	0	0
Stock option exercises	7,694	1,137	0	6,557	0	0	0
Restricted stock awards, net of forfeitures	0	539	0	(539)	0	0	0
Purchase of Company common stock	(146,590)	0	(14,785)	(109,914)	(21,891)	0	0
Acquisition	18,857	0	0	0	0	0	18,857
Noncontrolling interest payment	(568)	0	0	0	0	0	(568)
Other	752	72		680	0	0	0
Balance at end of period at Sep. 30, 2011
Balance at beginning of period at Dec. 31, 2011	1,412,195	224,666	(1,710)	1,430,330	(367,044)	105,852	20,101
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	138,742	0	0	0		10,979	1,600
Net Income (Loss) Attributable to Parent	126,163
Dividends declared on common stock	(36,582)	0	0	(36,582)	0	0	0
Employee share-based compensation earned	8,217	0	0	8,217	0	0	0
Stock option exercises	17,347	2,853	0	14,494	0	0	0
Restricted stock awards, net of forfeitures	0	483	0	(483)	0	0	0
Purchase of Company common stock	(144,607)	0	(12,400)	(79,828)	(52,379)	0	0
Noncontrolling interest payment	(405)	0	0	0	0	0	(405)
Other	948	82		866	0	0	0
Balance at end of period at Sep. 30, 2012	$ 1,395,855	$ 228,084	$ (14,110)	$ 1,337,014	$ (293,260)	$ 116,831	$ 21,296