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Intangible Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Estimated amortization of intangible assets with determinable lives        
2014 (remaining three months) $ 1,985      
2015 7,171      
2016 7,024      
2017 6,553      
2018 4,301      
2019 and beyond 7,972      
Net intangible assets $ 35,006 $ 27,550 $ 29,415 $ 23,259