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BALANCE SHEET ITEMS - Future Amortization (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Estimated future annual amortization expense for acquired intangible assets    
2018 $ 59,369  
2019 72,587  
2020 63,414  
2021 59,227  
2022 50,646  
Thereafter 148,714  
Net Carrying Amount $ 453,957 $ 362,181