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Intangible Assets Estimated Future Annual Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
2014 (amount remaining at September 30, 2014) $ 10,701  
2015 34,505  
2016 27,234  
2017 20,169  
2018 14,102  
Beyond 2018 48,721  
Total intangible assets subject to amortization $ 155,432 $ 195,840