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Goodwill and Other Intangible Assets Estimated Future Amortization Expense (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Goodwill [Line Items]        
Amortization expense, intangible assets $ 5,600,000 $ 3,400,000 $ 15,600,000 $ 14,100,000
Remaining amouns in 2012 6,199,000   6,199,000  
2013 22,933,000   22,933,000  
2014 13,703,000   13,703,000  
2015 6,949,000   6,949,000  
2016 1,663,000   1,663,000  
Thereafter 0   0  
Estimated future amortization expense, intangible assets, total $ 51,447,000   $ 51,447,000