Business Segment Information (Reconciliation Of Total Operating Profit Reported For Business Segments To Income From Operations In Consolidated Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total operating profit from segments above	$ 256,350	$ 245,843	$ 256,783
Corporate overhead expenses	(45,759)	(43,398)	(40,715)
Noncontrolling interest reflected in segments	975	1,620	1,465
Income from operations	$ 211,566	$ 204,065	$ 217,533