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Intangible Asset and Goodwill (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Estimated future amortization expense of intangible assets    
2015 (remaining 9 months) $ 18,776us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 24,318us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2017 23,709us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2018 10,827us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2019 1,789us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Thereafter 3,630rmbs_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour  
Net Carrying Amount $ 83,049us-gaap_FiniteLivedIntangibleAssetsNet $ 89,371us-gaap_FiniteLivedIntangibleAssetsNet