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Acquisitions, Intangible Assets and Goodwill (Future Amortization Expense) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite lived intangible assets future amortization expense    
Remaining for year ending December 31, 2018 $ 15,092  
Year ending December 31, 2019 38,021  
Year ending December 31, 2020 33,721  
Year ending December 31, 2021 29,989  
Year ending December 31, 2022 29,012  
Thereafter 92,332  
Net Carrying Amount $ 238,167 $ 272,186