v2.4.0.6
Intangible Assets (Schedule Of Changes In The Carrying Amount Of Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Jan. 17, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]      
Balance at December 31, 2011 $ 1,078,919   $ 1,004,102
Goodwill resulting from acquisition 74,817 74,817  
Balance at March 31, 2012 $ 1,078,919   $ 1,004,102