WARRANTS (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended
	Jun. 30, 2017	Oct. 07, 2016	Jun. 30, 2017	Jan. 31, 2017	Feb. 28, 2011	Dec. 31, 2018	Dec. 31, 2017	Oct. 04, 2017	Jun. 16, 2017	Nov. 09, 2010
Sponsors Warrants
Sponsors and Management Warrants
Warrants outstanding (in shares)										1,916,667
Exercise price (in dollars per share)										$ 50.00
Warrants exercised (in shares)	1,136,517
Warrant liabilities							$ 332.2
Management Warrants
Sponsors and Management Warrants
Proceeds from issuance of management warrants					$ 19.0
Management Warrants | Chief Executive Officer
Sponsors and Management Warrants
Exercise price (in dollars per share)								$ 124.64
Underlying shares associated with warrant (in shares)					2,367,985
Number of shares of common stock under warrants exercised (in shares)			1,614,803
Number of shares called by warrants (in shares)									1,965,409
Total warrant price									$ 50.0
Management Warrants | President
Sponsors and Management Warrants
Exercise price (in dollars per share)					$ 42.23			$ 117.01
Warrants exercised (in shares)				198,184
Underlying shares associated with warrant (in shares)					315,731
Number of shares donated to charitable trust (in shares)				6,850
Number of shares issued as per warrant provision for which share settled				4,400
Number of shares called by warrants (in shares)								87,951
Total warrant price								$ 2.0
Management Warrants | Chief Financial Officer
Sponsors and Management Warrants
Exercise price (in dollars per share)		$ 112.08			$ 54.50
Underlying shares associated with warrant (in shares)					178,971	98,549
Proceeds from issuance of management warrants		$ 1.0
Number of shares called by warrants (in shares)		50,125