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	51,437	0	0	0	38,764	11,502	1,171
Dividends declared on common stock	(11,930)	0	0	(11,930)	0	0	0
Employee share-based compensation earned	2,253	0	0	2,253	0	0	0
Stock option exercises	3,182	484	0	2,698	0	0	0
Restricted stock awards, net of forfeitures	0	539	0	(539)	0	0	0
Purchase of Company common stock	(30,245)	0	(3,204)	(27,041)	0	0	0
Other	64	11	0	53	0	0	0
Balance at end of period at Mar. 31, 2011	1,494,709	243,054	(4,189)	1,568,606	(438,695)	124,270	1,663
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	54,060	0	0	0	48,025	5,760	275
Dividends declared on common stock	(10,960)	0	0	(10,960)	0	0	0
Employee share-based compensation earned	2,574	0	0	2,574	0	0	0
Stock option exercises	2,323	422	0	1,901	0	0	0
Restricted stock awards, net of forfeitures	0	483	0	(483)	0	0	0
Purchase of Company common stock	(75,105)	0	(6,765)	(44,780)	(23,560)	0	0
Other	8	1	0	7	0	0	0
Balance at end of period at Mar. 31, 2012	$ 1,385,095	$ 225,572	$ (8,475)	$ 1,378,589	$ (342,579)	$ 111,612	$ 20,376