COMMITMENTS AND CONTINGENCIES (Details 3) - Violations of California securities laws, common laws and unfair business practices act $ in Millions	Feb. 02, 2007 defendent plaintiff	Jan. 26, 2016 USD ($)	Dec. 15, 2010 USD ($)
Gain contingency, legal proceedings
Number of shareholder plaintiffs | plaintiff	5
Number of other defendants | defendent	8
Percentage of control in prime brokerage market by defendants	80.00%
Settlement agreement consideration			$ 4.5
Subsequent event
Gain contingency, legal proceedings
Settlement agreement consideration		$ 20.0