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Intangible Asset and Goodwill (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Estimated future amortization expense of intangible assets    
2013 (remaining 9 months) $ 24,166  
2014 27,492  
2015 26,841  
2016 25,974  
2017 24,500  
Thereafter 16,957  
Net Carrying Amount $ 145,930 $ 153,173