Acquisitions (Purchase Price Allocation To Assets Acquired And Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011 Fiscal Year 2011 Acquisitions [Member]	Dec. 31, 2010 Fiscal Year 2010 Acquisitions [Member]
Business Acquisition [Line Items]
Property and equipment	$ 3,597	$ 5,523
Intangible assets	89,881	25,932
Other assets, net of cash acquired and liabilities assumed	(2,828)	(4,926)
Gain from bargain purchase		(37)
Net assets acquired	$ 90,650	$ 26,492