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, 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
Net Income (Loss) Attributable to Parent	48,025
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	(75,106)	0	(6,765)	(44,781)	(23,560)	0	0
Excess tax benefits from share based awards	0
Other	9	1	0	8	0	0	0
Balance at end of period at Mar. 31, 2012
Balance at beginning of period at Dec. 31, 2012	1,362,827	211,057	(10)	1,307,058	(286,795)	111,717	19,800
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Comprehensive income	53,206	0	0	0		(5,512)	1,098
Net Income (Loss) Attributable to Parent	57,620
Dividends declared on common stock	(12,698)	0	0	(12,698)	0	0	0
Employee share-based compensation earned	2,830	0	0	2,830	0	0	0
Stock option exercises	3,094	350	0	2,744	0	0	0
Restricted stock awards, net of forfeitures	0	378	(3)	(375)	0	0	0
Purchase of Company common stock	(1,708)	0	(109)	(676)	(923)	0	0
Excess tax benefits from share based awards	772	0	0	772	0	0	0
Payments to Acquire Additional Interest in Subsidiaries	8,333	0	0	(1,696)	0	0	(6,637)
Noncontrolling interest payment	(900)	0	0	0	0	0	(900)
Other	(9)	1	0	(10)	0	0	0
Balance at end of period at Mar. 31, 2013	$ 1,399,081	$ 211,786	$ (122)	$ 1,297,949	$ (230,098)	$ 106,205	$ 13,361