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Intangible Assets and Goodwill (5 Year Future Amortization ) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2017 $ 11,213
2018 9,191
2019 6,686
2020 4,904
2021 $ 3,150