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Intangible Assets Estimated Future Annual Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
2014 $ 44,542  
2015 35,740  
2016 28,113  
2017 20,908  
2018 14,776  
Beyond 2018 51,761  
Total intangible assets subject to amortization $ 195,840 $ 219,371