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Intangible Assets and Goodwill (Future Amortization Expense) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Finite lived intangible assets future amortization expense    
Remaining for year ending December 31, 2019 $ 30,303  
Year ending December 31, 2020 35,564  
Year ending December 31, 2021 31,026  
Year ending December 31, 2022 29,798  
Year ending December 31, 2023 26,726  
Thereafter 69,588  
Net Carrying Amount $ 223,005 $ 227,137