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Intangible Assets Estimated Future Annual Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
2015 $ 33,562us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 26,522us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 19,485us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 13,571us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 10,501us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Beyond 2019 36,268us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total intangible assets subject to amortization $ 139,909us-gaap_FiniteLivedIntangibleAssetsNet $ 195,840us-gaap_FiniteLivedIntangibleAssetsNet