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Intangible Assets Estimated Future Annual Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
2013 (amount remaining at September 30, 2013) $ 10,598  
2014 44,189  
2015 35,440  
2016 27,869  
2017 20,718  
Beyond 2017 65,816  
Total intangible assets, net $ 204,630 $ 219,371