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Acquisitions, Intangible Assets and Goodwill (Future Amortization Expense) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Finite lived intangible assets future amortization expense    
Remaining for year ending December 31, 2018 $ 25,997  
Year ending December 31, 2019 38,023  
Year ending December 31, 2020 33,722  
Year ending December 31, 2021 30,001  
Year ending December 31, 2022 29,012  
Thereafter 92,370  
Net Carrying Amount $ 249,125 $ 272,186