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BALANCE SHEET ITEMS - Future Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Estimated future annual amortization expense for acquired intangible assets    
2020 $ 15,351  
2021 60,289  
2022 51,846  
2023 44,193  
2024 42,572  
Thereafter 65,677  
Net Carrying Amount $ 279,928 $ 330,995