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Intangible Asset and Goodwill (Details 4) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Estimated future amortization expense of intangible assets    
2013 (remaining 6 months) $ 17,132  
2014 27,599  
2015 26,949  
2016 26,081  
2017 24,625  
Thereafter 17,009  
Net Carrying Amount $ 139,395 $ 153,173