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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	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting [Abstract]
Total operating profit from segments above	$ 73,547	$ 58,856
Corporate overhead expenses	(13,794)	(11,082)
Noncontrolling interest reflected in segments	289	315
Income from operations	$ 60,042	$ 48,089

Amount of net income or loss for the period allocated to noncontrolling shareholders, unit holders, partners, or other equity holders in one or more of the entities consolidated into the reporting entity's financial statements other than those noncontrolling interests already defined within the taxonomy.

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