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Goodwill and Intangible Assets (Future amortization expense) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2015 $ 2,533us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2016 2,533us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 2,533us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 2,533us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2019 2,533us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
2020 and thereafter 9,713us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Net carrying value $ 22,378us-gaap_FiniteLivedIntangibleAssetsNet $ 24,911us-gaap_FiniteLivedIntangibleAssetsNet $ 27,444us-gaap_FiniteLivedIntangibleAssetsNet