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Intangible Assets and Goodwill (Future Amortization Expense) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Finite lived intangible assets future amortization expense    
Remaining for year ending December 31, 2021 $ 22,721  
Year ending December 31, 2022 29,315  
Year ending December 31, 2023 26,465  
Year ending December 31, 2024 26,465  
Year ending December 31, 2025 19,805  
Thereafter 27,494  
Net Carrying Amount $ 152,265 $ 159,839