SEGMENT AND GEOGRAPHIC INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total revenue	$ 235,224	$ 268,944	$ 256,863	$ 225,756	$ 318,920	$ 302,192	$ 272,048	$ 268,952	$ 986,787	$ 1,162,112	$ 955,419
United States
Segment Reporting Information [Line Items]
Total revenue									581,853	722,440	681,569
Europe
Segment Reporting Information [Line Items]
Total revenue									174,445	193,441	137,411
Asia
Segment Reporting Information [Line Items]
Total revenue									88,917	95,735	61,566
Rest of the world
Segment Reporting Information [Line Items]
Total revenue									$ 141,572	$ 150,496	$ 74,873