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Subsequent Event (Acquisitions Accounted For As Business Combinations) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Arrowhead [Member]
Jan. 09, 2012
Arrowhead [Member]
Subsequent Event [Line Items]        
Date of Acquisition     January 9  
Cash Paid $ 167,444,000 $ 158,636,000 $ 397,531,000 $ 397,531,000
Note payable         
Recorded Earn-out Payable 30,525,000 25,090,000 4,332,000 4,332,000
Net assets acquired 199,163,000 184,485,000 401,863,000  
Maximum Potential Earn-out Payable $ 78,207,000 $ 54,305,000 $ 5,000,000