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FAIR VALUE MEASUREMENTS - DEBT (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Mar. 31, 2016
Jul. 12, 2013
Jun. 18, 2013
Nov. 16, 2011
1.75% Convertible Notes due 2016          
DEBT          
Interest rate on convertible notes (as a percent) 1.75% 1.75%     1.75%
Estimated fair value of convertible notes $ 589,200       $ 197,373
1.00% Convertible Notes due 2018          
DEBT          
Interest rate on convertible notes (as a percent) 1.00% 1.00% 1.00% 1.00%  
Estimated fair value of convertible notes $ 603,951   $ 225,567