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Intangible Assets Estimated Future Annual Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
2013 (amount remaining at March 31, 2013) $ 30,901  
2014 43,672  
2015 35,055  
2016 27,306  
2017 20,295  
Beyond 2017 63,918  
Total intangible assets, net $ 221,147 $ 238,771