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Intangible Assets Estimated Future Annual Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
2015 (amount remaining at March 31, 2015) $ 23,956us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 24,768us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 18,249us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 12,558us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 9,757us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Beyond 2019 33,143us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total intangible assets subject to amortization $ 122,431us-gaap_FiniteLivedIntangibleAssetsNet $ 139,909us-gaap_FiniteLivedIntangibleAssetsNet