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, 2010	$ 1,479,948	$ 242,020	$ (985)	$ 1,603,112	$ (477,459)	$ 112,768	$ 492
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Total comprehensive income	139,307				144,903	(6,916)	1,320
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings	(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
Purchase of noncontrolling interest	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(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
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Total comprehensive income	160,027				152,546	5,865	1,616
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings	(49,253)			(49,253)
Stock option exercises	18,389	2,993		15,396
Restricted stock awards, net of forfeitures	0	(483)		(483)
Employee share-based compensation earned	10,983			10,983
Purchase of Company common stock	(186,766)		(15,467)	(99,002)	(72,297)
Purchase of noncontrolling interest	(3,000)			(1,762)			(1,238)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(679)						(679)
Retirement of treasury shares	0	(17,167)	(17,167)
Other	931	82		849
Balance at end 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]
Total comprehensive income	125,812				143,848	(23,276)	5,240
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings	(57,229)			(57,229)
Stock option exercises	9,313	1,087		8,226
Restricted stock awards, net of forfeitures	0	(378)	(3)	(375)
Employee share-based compensation earned	11,925			11,925
Purchase of Company common stock	(4,712)		(275)	(1,508)	(2,929)
Acquisition	118						118
Purchase of noncontrolling interest	(23,333)			(10,023)			(13,310)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(1,700)						(1,700)
Retirement of treasury shares	0	(278)	(278)
Other	1,357	83		1,274
Balance at end of period at Dec. 31, 2013	$ 1,424,378	$ 212,327	$ (10)	$ 1,259,348	$ (145,876)	$ 88,441	$ 10,148