Goodwill And Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended
	Dec. 31, 2010	Sep. 30, 2011	Dec. 31, 2009
Goodwill And Intangible Assets [Abstract]
Estimated cost of capital, minimum		6.50%
Estimated cost of capital, maximum		14.00%
Hypothetical decrease to fair values of each reporting unit	10.00%
Estimated amortization expense for intangible assets, current year		$ 5,400,000
Estimated amortization expense for intangible assets, year 2012		17,100,000
Estimated amortization expense for intangible assets, year 2013		17,000,000
Estimated amortization expense for intangible assets, year 2014		15,900,000
Estimated amortization expense for intangible assets, year 2015		13,700,000
Estimated amortization expense for intangible assets, year 2016 and thereafter		56,800,000
Intangible assets, net	162,636,000	152,553,000	118,731,000
Intangibles with indefinite useful lives		$ 26,700,000
Number Of Reporting Units		12