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DEBT - 1.00 CONVERTIBLE NOTES (Details) - 1.00% Convertible Notes due 2018 - USD ($)
Jun. 18, 2013
Mar. 31, 2019
Mar. 31, 2018
Convertible Notes      
Interest rate   1.00% 1.00%
Convertible Debt      
Convertible Notes      
Interest rate 1.00%    
Principal amount at issuance $ 250,000,000    
Percentage of par value at which debt was issued 98.50%    
Proceeds from issuance of debt $ 283,188,000    
Proceeds from issuance of debt, overallotment $ 37,500,000