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Acquisitions And Other Investments (Summary Of Purchase Price Allocation For Acquisitions) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
years
Dec. 31, 2009
years
Acquisitions And Other Investments [Abstract]      
Goodwill $ 22,522,000 $ 13,305,000 $ 22,442,000
Intangible assets with definite lives 21,567,000 [1] 5,211,000 [1] 14,897,000 [1]
Net liabilities and non-controlling interests acquired (590,000) [2] (1,558,000) [2] (15,265,000) [2]
Total 43,499,000 [3] 16,958,000 [3] 22,074,000 [3]
Weighted average life of acquired intangible assets 3.7 3.5 5.1
Cash acquired 6,000,000 1,000,000 5,000,000
Business acquisition purchase price accrued 3,000,000    
Noncash consideration     $ 20,000,000
[1] The weighted average life of acquired intangible assets during 2011, 2010 and 2009 was 3.7 years, 3.5 years and 5.1 years.
[2] Includes cash acquired of $6 million, $1 million and $5 million during 2011, 2010 and 2009.
[3] As of December 31, 2011, $3 million of the total purchase price was accrued with the remainder paid in cash during the respective years. For 2009, the total purchase price includes noncash consideration of $20 million related to the removal of an equity method investment upon our acquisition of a controlling interest, as discussed below, with the remainder paid in cash during the year.