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BALANCE SHEET ITEMS - Future Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Estimated future annual amortization expense for acquired intangible assets    
2018 $ 19,933  
2019 74,510  
2020 68,272  
2021 63,839  
2022 54,754  
Thereafter 157,244  
Net Carrying Amount $ 438,552 $ 362,181