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Intangible Assets Estimated Future Annual Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets subject to amortization $ 238,771 $ 239,500
Intangible Asset Subject to Amortization [Member]
   
Finite-Lived Intangible Assets [Line Items]    
2013 42,526  
2014 38,099  
2015 31,122  
2016 24,615  
2017 18,206  
Beyond 2017 64,803  
Total intangible assets subject to amortization $ 219,371 $ 239,500