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Acquisitions, Intangible Assets and Goodwill (Future Amortization Expense) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Finite lived intangible assets future amortization expense    
Remaining for year ending December 31, 2018 $ 37,598  
Year ending December 31, 2019 38,330  
Year ending December 31, 2020 33,744  
Year ending December 31, 2021 30,119  
Year ending December 31, 2022 29,038  
Thereafter 92,489  
Net Carrying Amount $ 261,318 $ 272,186