Goodwill And Other Intangible Assets (Summary Of Allocation Of Acquisition Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Customer Related Intangibles [Member] years	Dec. 31, 2010 Customer Related Intangibles [Member] years	Dec. 31, 2011 Software Acquired [Member] years	Dec. 31, 2010 Software Acquired [Member] years	Dec. 31, 2011 Trade Name [Member] years	Dec. 31, 2010 Trade Name [Member] years	Dec. 31, 2011 Leases, Acquired-In-Place [Member] years	Dec. 31, 2010 Leases, Acquired-In-Place [Member] years
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 106,094	$ 92,831	$ 90,258
Acquisition intangibles, gross	80,513	72,333		50,552	44,992	26,363	23,983	2,211	1,971	1,387	1,387
Weighted Average Amortization Period (in years)				16	17	5	5	18	19	5	5
Accumulated Amortization	$ 45,045	$ 40,311		$ 20,409	$ 17,163	$ 22,617	$ 21,492	$ 1,048	$ 963	$ 971	$ 693