Goodwill And Other Intangible Assets (Summary Of Other Intangible Assets And Related Accumulated Amortization) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	$ 80,513,000	$ 72,333,000
Accumulated amortization	(45,045,000)	(40,311,000)
Acquisition intangibles, net	35,468,000	32,022,000
Post acquisition software development costs	36,701,000	36,701,000
Accumulated amortization	(36,541,000)	(36,416,000)
Post acquisition software costs, net	160,000	285,000
Total other intangibles	35,628,000	32,307,000
Total amortization expense	4,900,000	5,500,000	5,100,000
Customer Related Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	50,552,000	44,992,000
Software Acquired [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	26,363,000	23,983,000
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	2,211,000	1,971,000
Leases, Acquired-In-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	$ 1,387,000	$ 1,387,000